As far as I know they have only been "officially" released as flac files.
Regarding the legality of all these releases. In my opinion the stats speak for themselves... These releases have been downloaded 1000's of times. They've even been plugged and advertised in rolling stone magazine as the best un-official source for definitive Beatles material, see this article http://www.rollingstone.com/news/coverstory/20200609/page/20
EMI is, shall we say slow off the mark. There's a wealth of material out there that could be used in this way to produce official re-masters, with bonus material but for some reason McCartney, Starr Harrison (Olivia) and Yoko don't want to be party to that. They tried it with the Anthology series and in my opinion although good, was disjointed and not really how they should have done it.
Back in 1998 when they released the 30th anniversary release of the White album everyone thought they would release the mono version... but they released the stereo version..... There was outcry. I for one felt cheated as i already owned the stereo CD version of the White album and ended up buying it again just to maintain my collection and for the miniture packaging the reissue came in. They had the opportunity to redeem themselves and missed the boat in my eyes.
The Purple Chick releases serve a purpose, they give the fans what they want... A chronological release of all the Beatles releases in both mono and stereo together with comprehensive session material. I agree, the Dr. Ebbetts stuff isn't perfect, but this man has taken the trouble of finding the best virgin vinyl sources and then after investing 1000' dollars or pounds into his hifi equipment has taken the time to needle drop these recordings for us to enjoy. These are as perfect as we're ever likely to see or hear. I for one think the vinyl mixes are better than the CD mixes... and yes there are differences. After listening to both I prefer the needle drops, they sound warmer, with more sonic range. this may be due to Dr. Ebbetts using valve amps etc, i'm not sure. All I do know is i'm very gratefull to Ebbetts and the guys at Purple Chick for taking the time to do this, or i would have been still suffering these crappy CD copies I have and my old crackly vinyl records..... Which i can't play anymore as I don't have a turntable