Correct ansswer is I don't know. I'd suggest directly asking the hack creators if they might, or if it can even be done. This is not a new question and I have yet to see a response suggesting PPC Flash will update beyond 11.5.
Eventually we will all leave our beloved PPC's to our collection, just as the 68000 series, versus our daily user. My PPC units still work great with iCab, TFF and the 11.5 hack. Toss in YouView or Mactubes and my old units are perfectly acceptable. If you demand the latest and greatest, like 4k or streaming HD, well, it's simply time to open your wallet.
Long live the PPC, have a great day!
Don't know what took me so long to find this, but sure glad I did. (I have a Power Mac G5 that is now supplemented by a 2012 Mac Mini, yes, that's how I regard the relationship. ) I still prefer to do social network stuff on the G5, but today I was running into the Flash wall with every video I tried to play. This hack did the trick. Hope it will keep working through a few more updates at least. Thanks to everyone who perseveres with the wonderful PPC Macs.