I think it's fair to describe a player performing at a mid table level as horrible for Manchester United. You claimed he was one of our better performers.
Context is indeed needed, and I agree we had (and still have) a host of problems, but a goalkeeper who was barely average within the league at goalkeeping, and one of the worst on the ball, ranked highly among our problems.
As for your edit, statistically you're just wrong. In terms of preventing goals, DDG let in 4.7 more than he should have last season, while Onana had prevented 5.7 more than he should have as of the 10th April, which was the second best in the league (see
here). As an aside, there's some serious irony in you making yet another statement without any evidence at all, given how you tried to gatekeep what reports were true (while of course providing no evidence of your own).