Seems Adobe has no idea what Apple is going to scrap and is just sort of at their whim. They're trying to "native-ize" as many things as they can, but only for read formats it seems. Write is another story as well. 

Looks like in that thread there was going to be a list provided of the known codecs that will lose support but it never got posted. 

Also, it would be a good idea to keep older versions of Adobe apps and read through all update notes and such to make sure they don't pull the rug out from under you like they did with dolby support in the recent 2018 updates.