I think, in general, it's possible to get a view of how an Executive Order is signed by looking at the example of the H-1B $100k fee signing (which we now understand to be far more constrained than it first appeared). Here's a video https://x.com/WatcherGuru/status/1969157504211808579 where President Trump's "we need more workers" is contrasted with his aides' statements.

It would appear the these things are less an act of the President as a fully informed person making decisions and more of the final rubber stamp on something that staff that he's picked have decided on.

Given that, I wouldn't expect him to personally know what he is signing. If, as I suspect, these pardons are pay-to-play deals, it's someone else managing the operation under his guidance and he's just the guy with the pen so to speak.