You might be right. Canard is the wrong word. We have no way of knowing whether the issues with Wilson are even false. Fair enough.
It is a distraction that is irrelevant. What Wilson is or isn't... hardly matters now that he left the team.
Pete, however, is still here. So his shortcomings, weaknesses, and predilections ARE relevant.
Since any improvement will depend on Pete, unless you think Lock can somehow improve enough to offset Carroll? (This thread is about the success with Lock this coming season, and that success likely depends more on Carroll than Lock - which isn't great news given Carroll's recent track record.)
It's the offseason, so distractions are all we've got right now.
One of Pete Carroll's central themes, and key to who he is, is the goal of trying to make everyone on the team the best version of themselves that they can be. Nobody here is predicting that Lock (or Geno, for that matter) are going to be the next late bloomer
a la Josh Allen, but it it's going to happen anywhere, it could very well be here. Neither Lock nor Geno have ever been in the situation they're in now -- prolonged open competition with legitimate chances to start, on a presumably non-dysfunctional team.
How will it turn out? It remains to be seen. But I will point out that "Carroll's recent track record" involves a QB that was at odds with pretty much every OC we've had in the past ten years, so I don't think it's quite the indicator you apparently think it is.
In the end, the nay-sayers might be right. Or they might be wrong. Any categorical claims either way are premature at best.