Imo, the temporal salvation is related to physical salvation from the world and worldly aspects that seek to destroy, mar, hinder... the walk and life of the believer. In that aspect, there is both the eternal preservation aspect and the believer obligation of perseverance.
But there is another aspect that may or may not be related to the thread.
Back in the early 1800's there was a thinking that considered salvation was "time" oriented. That is, the salvation of a person was not established from God, but was according to the timeline of human history.
OT saints were not saved until the blood was shed, the Christ had died, the resurrection had been accomplished, and then the OT saints could accept or reject the salvation. Sometimes, one might hear a preacher rattle about the Christ having to preach to the OT folks between His death and resurrection, and sometimes they will lift out of context passages about how hell "enlarged itself" after the redeemed were removed so that others not saved would find room available and could enjoy the torments.
However, that human time oriented thinking was in conflict with both the statements of Scriptures (Abraham being righteous while still alive) and the statements concerning the Lord Jesus Christ slain before or from the foundations of the world (before time began).
The time oriented salvation is just not scripturally sound.
Before human time began, Christ was already slain.
Before human time began, God had already appointed (elected) those whom He would redeem.
Before human time began, Eternity was, is, and will always be.
Why then are some so very desirous to refuse the plain evidences of Scripture and adopt some human time oriented salvation view?
Because the temporal is all they have to offer. They cannot offer a God that is Sovereign over time, space, existence, and purposes all things to His good pleasure and according to His authority. Such folks must have a God that is unaware of the future, who is not certain how large to make the eternal lake of fire and the new heaven and earth. They must place the aspects of human physics to constrain the one who designed the universe and can only perceive and have a concept of that which is earthy and earthly minded.