What the Pulstar issue says is that Dion was aware that the game would never get a western release so simply converted a shitload of MVS carts and gutted an equal amount of Neo CD copies of the game just for the manual to try and make it look as authentic as possible. We know from previous posts that buyers had complained about the lack of a manual for other releases so I imagine this isn't the only game where this has happened.
Another thing that you have to remember is that nearly all Neo Geo games be they cart based or CD are multi language. You gut any region sac cart and replace the ROMs with those in this case from a JPN Pulstar MVS cart and then play said converted cart on a USA or Euro home system and lo and behold you've got an English game. How official it is is a very grey area as the only genuine English part of the whole package is the booklet that's been taken out of a Neo Geo CD game. It would be interesting to see the manual from the ''official'' USA release of KOF 2000 as that game was never released for the CD system. As Dion himself has admitted, the only ones in existence are conversions so was a manual even produced?