OK, let's try.
Blu-ray is certainly the film (video)
the other 2 versions (standard and deluxe) could be audio or video discs.
If video, the standard version should be the DVD, while the 2discs version should be the standard DVD + another one (with bonus footage?)
If audio, the standard version could be a CD with the highlights of the show, as suggested by Julio (I hope they will not release this shame), while the 2 discs version could be the standard concert (why they should call it deluxe?)
My opinion is that - again as suggested by Julio - the standard edition will be 2CD, while the one called "Deluxe 2 discs" will be 2CD + 1DVD.
Regarding the date of the first release of Alchemy on CD, so far no one has provided definitive evidences. I try to carry another brick in favour of mid-80s
This is the pic of an early release of Alchemy on CD: to my knowledge (but I could be wrong) Vertigo Label in 90s didn't use this blue pattern (which was present in the 80's releases).
Anyway I agree that the "anniversary" should refer to the date of the first release, in any format.
Last thing: Blu-ray is certainly a video. The first video release (on VHS) was certainly in 1984 (I hope nobody doubt about it), so, what means 20th anniversary edition referred to the video?