No one should be allowed to make stuff up.
What he did was stupid and also unkind.
But it doesn't detract from what Cummings did or the story.
Cummings did wrong. Him and Boris eroded trust because when story broke they denied allegations which were true.
And he admitted once evidence was produced it was true.
Just because some idiot decided to make up another sighting that doesn't change it. And doesn't make the true allegations false.
What Matthews did was undermine what the papers investigated. And the MSM perhaps should have verified this information before printing it.
2 wrongs don't make a right.