Yes, that's true. And I agree that there is some malicious actor; a bag of Base64-encoded code doesn't get inserted as an innocent accident. But the way you've expressed yourself, more than once, suggests you have reason to believe the malicious actor is other than the maintainer.

Do you have any evidence, one way or the other?

Let's not chop logic. I don't think you've been completely frank about this. The commit was signed by the maintainer, right, using a private key? That means the maintainer "done it", absent evidence to the contrary. And apparently the maintainer is silent.