Why no Rupert Comp 754 and Buss Comp 369?

I came across these interesting articles about VCM at Yamaha:

Apparently there are emulations of the 2254 and 33609 Neve compressors available on the Rivage PM series mixers, as well as a 1073 EQ (?).

Is there a reason these haven’t made it to desktop systems as part of the Yamaha Vintage Collection like the 1176 (Compressor 276)? Licensing? Technological hurdles?