the guy literally built the implementation for this already, over years. then from another angle others pushed a different logic that makes his implementation not feasible.
this is fine, both solution-types (global hash vs. managed service) have pros and cons. His way was WAY easier for transcoding. The Blossom way you have to prove, with hashes, that all of the transcoded variants are the "same thing" (even though in file terms they are not at all the same thing), and in a way that someone is going to pay for (the 'proving these variants are from the same original' part is gonna make it super expensive), etc.
to say, hey, yes your way would have been way easier, but anyway, kindly start again on another years-long journey, on a path with obstacles that you didn't ask for, with extra costs that you didn't ask for, and sure, nostr might do an end-run around you once again, but this is the nostr way .. i dunno, i feel for the guy.