Why not? In some cases it might amount to fraud or something, but in general, why would it be prohibited?
Standard CYA procedure
For all we know, Epstein could have punished Trump and made him write "I'm a little bitch boy" 2,000 times and it took up 119 pages so every line got redacted. /madlibs
Because to me it seems like altering and disseminating a document would be under 1st amendment protection, unless combined with some action that e.g. causes someone else harm or tricks the state into doing something it should not do or something.
The CYA is just me saying I'm not responsible for anything anyone makes, because anyone can make a document say anything with this tool.
If so, I missed it.