That dosen't change the fact that while he was walking the earth before his death and resurrection he spoke with Moses, who had died centuries earlier, in front of 3 Apostles. He communicated with them.
And the resurrection still had not taken place. Samuel also had appeared to Saul. And the resurrection still had not taken place. God granted a special dispensation in each case to manifest his glory to certain individuals in history. Peter speaks of this experience and then makes a startling statement:
2 Peter 1:16 For we have not followed cunningly devised fables, when
we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
--We were eyewitnesses of power and coming and majesty of Jesus Christ. This is true. It is not something he is making up. It is not a cunningly devised fable. He is an eyewitness of this.
2 Peter 1:17 For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased.
--He saw that it was Christ that received the honor and glory from the Father. And he heard the voice from heaven from the Father, "This is my beloved Son in whom I am well pleased.
2 Peter 1:18 And this voice which came from heaven we heard, when we were with him in the holy mount.
--And to make no mistake he tells which event he is referring to--the transfiguration of Christ in the holy mount.
--This is an experience that he would never forget, that James and John would never forget, that any man would have had the same privilege would never forget. It is the most wonderful amazing experience that anyone could ever have--to see Jesus glorified, and Moses and Elijah standing with him in some kind of celestial body, but not a resurrected body.
But then Peter makes the most amazing statement:
2 Peter 1:19 We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
--We have a more sure word of prophecy.
Greater than any experience then I have had, then you or I may ever have, is this book, the Bible. It is more certain. It is inspired of God. Its promises are sure and certain. He elevates the Word of God above his experience on the Mount.
God allowed these men to appear to others in special circumstances. It does not mean that they can see what is happening on earth. It does not say even there that they could see all what was happening on earth. In fact we would assume they could not. They appeared only before James, John and Peter, as the text says.
Still doesn't change that fact and we can see in the Book of Revelation the Elders bringing the prayers of the saints before God. It is clear from the passage that Moses and Elijah was speaking to Jesus about his comming trials. So it certainly is clear that they knew what was going on.
There are three times where such a scene is mentioned (actually twice).
Revelation 5:8; 8:3,4.
In the first scene the 24 elders offer incense.
Revelation 5:8 And when he had taken the book, the four beasts and four
and twenty elders fell down before the Lamb, having every one of them harps, and golden
vials full of odours, which are the prayers of saints.
9 And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;
"bowls full of incenses" (Darby's translation)
--They did not offer prayer, they offered incense which is representative of prayer. Christ alone is the one who plays the part of mediator as the Bible specifically says. One cannot go against what the Bible says.
As the scene plays out, the 24 elders are primarily engaged in the worship of the Lamb. Read verse 9.
In the second scene, it is angels:
Revelation 8:3 And another angel came and stood at the altar, having a golden censer; and there was given unto him much incense, that he should offer
it with the prayers of all saints upon the golden altar which was before the throne.
Revelation 8:4 And the smoke of the incense,
which came with the prayers of the saints, ascended up before God out of the angel's hand.
--Again incense is offered, this time it is by angels. The incense is representative of prayers, but is not the prayers itself.
Luke 1:10 And the whole multitude of the people were praying without at the time of incense.
--When the priest offered incense, it was a time of prayer. It is all very symbolic.