Ownership of the many aspects of the Pink Floyd catalog remain murky (look it up).
DSOTM is obviously the commercial behemoth of their recorded output and whoever owns it (or has recently acquired it) is milking it once again.
the Immersion box set (2011, Parlophone, now Warner owned) is where the first BluRay disc appeared, along with marbles & scarf.
I saw the tour in summer ‘73 and it was epic, especially since PF had sorta slid into semi-obscurity after their previous album, Obscured by Clouds.
I don’t see that particular “rainbow” treatment anywhere other than print ads so this whole thing, IMHO, is a non-issue.