As Pogue and others have pointed out this is probably his second pass that has led to a goal conceded? I’d argue for all else he offers that is absolutely something I’m willing to put up with.
As for the “soon made up for it” comment I think it’s really lazy to be thinking because we conceded it’s his fault? Onana is a well above career GK and I would argue is world class for a GK in terms of distribution.
You could find more examples of his long passing if you cared to search.
It was his fault he conceded, the same as it was his fault we failed in the ECL, the most goalkeeping errors in single season since 2018/19.
The same rules apply, if you hit enough shots at him he's going to stop some, his long ball is not as good as you make out, for every Hollywood pass he makes, there are many that do not get to the intended target, or result in the ball coming straight back at us.
His decision making is poor
His diving is poor
He's poor on his near post.
He's poor in the air
He got dropped during AFCON
He chartered an airplane to the wrong airport.
The guy just lacks intelligence.
This guy is supposed to be the finished article, put him against a prime Schmiechel, VDS or even De Gea and he's not fit to clean their boots!