But running FaceTime with H.265 would much more require an encoder rather than decoder. It's the same as with AirPlay Mirroring. You need to get your stream of pictures into H.265 in realtime!
If you'd actually read the linked article you'd see it actually says that the A8 probably includes a specialised HEVC encoder/decoder. As anyone with even a basic understanding of FaceTime would understand. But apparently bothering to read the link would be too much effort wouldn't it?