The problem with them being the only second party dev mentioned is that Sony actually has a bunch of second party/non-exclusive developers and thus Ballistic Moon sticks out like a sore thumb on the list in question.They are facts, of course they mean something.
With the facts we have is a '2nd party' 'partner' with several former Supermassive devs who is working on an Unreal Engine 5 game to be published by Sony, so it's a 2nd party game, codenamed Project Bates, since 2019. Sony replaced a list of 'partner' studios where they had some 1st party studios and Ballistic Moon with a text mentioning '1st and 2nd party', which means they continue being 2nd party.
It is also a fact that the supposed crappy 'leaked' table is full of wrong and fake data, including the game engine, codename of this project, plus the data of when XDEV started to work on the project (according to the table late 2021, according to Ballistic Moon statements and LinkedIn profiles, early 2019).
There is not a single fact to back the speculation that they have been acquired.
And your evidence for the chart being faked is dodgey, too. Omitting "Project" from Project Bates in an internal chart isn't weird at all. People short-handed stuff all the time back when I was in *insert my previous job here*. Same for the one date descrepency, could have easily been production vs pre-production/blue sky.