This is a league spray chart on regular season games from 2021-2025 on sweepers (the pitch Imanaga gave up to Vaughn) and the location of the plate in which it was thrown, while also being only thrown from LHP to RHH. It's a pitch location that is rarely hit for home runs (just one instance) and is almost always an out.
To clarify where the pitch was, it was #7 - well off the inside of the plate - it was not a strike:
Your initial point might be to somehow blame Imanaga for that. That because he's so good at allowing home runs, his sweeper which has graded out better than league average in shape since coming into the league, was super easy to hit - but that's just not accurate.
His pitch to Willson Contreras is much worse. I'm not going to defend him on that one. But three of the runs scored on that swing and it was pretty damn lucky.
This idea, again, that this was some fireable offense is exactly what was said prior; it is hyperbole.