That isn't the only 'semi-pro' (sic) lathe you can get. I've seen bumph for 2 others that bolt onto a DD turntable.
As for the Vestax unit, it's been around since the turn of the decade. They couldn't release it because it wouldn't cut better than mono, with HF shelving at 8k... They had better lathes than that in the '40s!! I believe it now cuts stereo, but only up to 8k.
BTW - apparently, the great Bernie Grundman uses a Scully lathe. I was told by a top lathe engineer that some people drive a Scully with a Technics SP10 turntable - that would potentially be cheaper than the Vestax and a lot better.
J