compliance is well down the scale of significant factors to the point of irrelevance in a good arm. You may find those who will argue with this but they always seem to relate matching issues they’ve had with other arms and not an Origin Live one.
Of course he would say that - he wants to sell as many arms as he can.
There's a sucker born every minute.
On the other hand, I partially agree in that statement - in my view the quality of the bearings is the most important, particularly with cartridges that put a lot of energy into the arm.
However, you miss the nuance of what he says - that compliance is less of an issue than many think - he does not claim that compliance has no impact. Origin live arms are medium to upper medium effective mass - they should work with most cartridges made today. It is more the difficult trackers, very low compliance and very high compliance cartridges that require more careful matching.
As far as the stone bodied Koetsus ( Onyx Golds ) that I have personally set up the best sound was obtained with FR64S & Sumko MDC800.
Note that those two arms sound different - the FR64S more extended top and bottom end, the MDC800 fuller midrange, less tight in the lower end.
This is my hands on experience, it wasn't a fantasy that everything I own must be the best - which appears to be the rationale for some.