Uhm, you're OH so silly.
They're doing the FINAL testing of the emulator integration using OS3.9 running in emulation. Thie is because it's the only way to _really_ know you've tested every last bit.
Once OS39 runs stable under emulation you're pretty much FINISHED with the critical emulation betatesting, NOT just begun.
The core parts are already done (they were done in C, so was tested on 68k before the kernel was ready).
Jesus, you just HAD to misunderstand the WHOLE point of the exercise, right?