Maybe there is no actual official list of commands which have been removed.
But in the other hand, most of people have littlebit common sense.
Put ex_interp in console and game itself tells ya:
"Unknown command: ex_interp"
End of case.
Ps. Hard to believe someone actually used that command for CS:GO since 2000, as CS:GO published in 2012, and what would be the idea of talking about CS:GO commands, when the commands mentioned are from completely different games which works on completely different game engines.