We'll probably never know, but it does all make a horrible sort of sense.
In software it's a tradition that when someone is fired, they are told to clear their desk and leave the premises immediately. If they did that to Oleg, then they would assume, incorrectly I'm sure, that anything he touched, could be a logic bomb. So, any code on Oleg's work computer would be out of bounds.
Which explains the mess, if Oleg and only Oleg was compiling the final builds, then suddenly all of the work is broken up, nobody has a build of the current software, all there is is what other people were working on at the time, and they are bits of a jigsaw puzzle with the body of the puzzle removed.
I suppose it's possible to do that, and still demand that Oleg appear in public to be working for the firm, why I can't really see, but it could be done.
The guy following on would be in a pickle, having to pick up the pieces and try to remake the jigsaw.
It wouldn't be Oleg's fault (except not finishing quick enough that it didn't happen), it wouldn't be Luthier's fault, it would almost not be the money men's fault, except the paranoia that didn't allow Oleg's work to be included.
It is just a guess, however it looks to me like as plausible an explanation for where we are now as we are going to get.