Yes, I have read that article. There are, of course, many that denounce his conclusions as intellectually lazy and dishonest.
When you look at what another person taught, it is best to look at the teachings of that other person and not how other people source the information.
The quotes I provided came initially from Vlach' paper. What I did was take the snips of quotes he offered and provided the entire context. I do not see how this paper could be anything but intentional dishonesty. The reason I say this is that had he included a few lines before or after several of his quotes they would disprove his thesis. This is dishonest. It is exactly what @Martin Marprelate has been doing to make the comments of others support his view.
BUT LET'S LOOK AT YOUR (AND THE AUTHOR'S CLAIM):
"But Luther did affirm penal substitution also as the following statements show:
'Therefore Christ was not only crucified and died, but by divine love sin was laid upon him.He has and bears all the sins of all men in His body—not in the sense that He has committed them but in the sense that He took these sins, committed by us, upon His own body, in order to make satisfaction for them with His own blood.'"
First, there is nothing in this comment that demonstrates Penal Substitution Atonement. Christ bearing the sins of all men in His body - not in the sense that they were His but that they were the sins of all men - in order to make satisfaction for them with His own blood is substitutionary but not Penal Substitution.
And if you read Martin Luther you will.....that is, you should....be able to discern the difference between his view and Penal Substitution.