Geoch, you are absolutely correct about the vertical bearings at 90° with the armtube, therefore not matching the angle at the headshell and therefore changing azimuth will change the VTA. I have harped on this issue with many tonearms before but nobody seems to care or at least sonically not noticeable to many so I stop commenting on that. Glad you bought it up. And, yes, changing pivot point will change overhang and zenith.
I was more impressed by the bearing arrangement than anything else, that having only three contact points is quite an achievement in design cleverness. Your concern is a legitimate one. And, yes, the video is too blurry in the background to make good judgment so I am one who should apologize.
Keep up the probing. :)
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