But it doesn't mean they are either. It could be a case that PS owners are buying PS5, and XB owners have given up console gaming. Or switched to Switch or PC. Or are happy to play on XBO still. For evidence, we'd need numbers.
Xbox sales tanked the moment Sony could deliver enough PS5 supply, meaning people that would have bought an XBox before where now buying a PS5 instead. If you don't think that's true, explain why Xbox sales tanked in parallel with the PS5 supply increase.
You act like i argued every single Xbox One owner not buying an XS switched to PS. Ofc some will have abandoned gaming, some will have switched to PC or Switch, but these people didn't wait for a PS5 supply increase to do that and it's also not the most likely path for these people, that's the one you didn't mention in your listing.
And yes this isn't 100% evidence, but it's, as i said in my first post, as close as you can get. The numbers you want don't exist, Ms doesn't know when someone buys a PS and Sony doesn't know that someone was on XBox before. The only thing you could get would be some estimates or a survey, but this isn't 100% evidence either.
What Sony revealed a year ago was that 30% of PS5 owners never owned a PS4, this is another strong indicator of Xbox users switching even before the supply was solved, but ofc no 100% evidence, because they all could have come from non gaming, PC or Switch instead ...
We might be able to get current console userbase and compare that to other points in history to see how this generation is faring. An obvious proof XB owners are switching is if PS5 sales at this point matches XB360 sales at their 3 year marks.
PS5 ww is far ahead of the 360 at this point in time, by ltd and ytd.
But PS5 sales are down, and we don't know what XB sales even are, there's no direct correlation showing XB users are migrating. That migration clearly happened last gen.
Down from what? If they reach their (somewhat doubtful) corrected forecast they are at PS4 level. Year to Year they have increased massively.
And that we don't know what Xbox sales are is wrong, we don't have the same picture as PS5 or Switch, because of no data from Ms, but the picture is clear with the tidbits we get.