Maybe I misunderstood, but to me it sounds like a mish-mash of UAE emulation boxes...?
There does seem to be a lot of BS spread on this subject. I was asking in the AROS irc channel lately if AROS supports integrated 68K emulation yet and was told yes, I was called a troll for asking if it was seamless/coherence mode or simply a UAE window popping up. After a good 20 mins of being fed various round-the-houses explanations, from what I see it is simply a UAE window popping up with its own Workbench and the program loaded inside there.
It works like RuninUAE on OS4, but it's not the same as JIT integration in MOS/OS4.