He was in a position where it would be impolite for him to have said those things. Speaking of eulogies, it would be like standing at a funeral and describing some really dishonorable death of the person being eulogized. It’s just not the right place for it.
He pretty much said the best that he could say under the circumstances.
But the best way to think about the speech was, it was his pathetic attempt to beg us to think positively of him as he shuffles off. He failed, and he knows he failed. Now he desperately wants to not be remembered as a failure.
The speech was simply the very best he could do to write his own version of his presidency, and yeah, it wasn’t very good, but he is such a failure that there wasn’t any better.