So yeah, as most guessed, Platinum 4 are the first 4 games that Platinum will self publish.
The website has just been updated, with "TW101R KS" being added under one of the stars.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.
https://gamrconnect.vgchartz.com/thread.php?id=241866&page=1