Sorry this is a big nope from me, There is no oversight, it's a non-profit run on donations from partners. No background checks on staff and no monitoring of changes that I am aware of for the staff (why would there be?)
Anyone could go on internet archives website and either bribe or threaten someone to make changes. The list all the staff by name and picture and role, I mean come on, that's a social engineer hackers wet dream.
Therefore this is not safe data to use in a court of law. That's my opinion.