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frankenbike-
The best.
Anyway. The issues I see are volume related. I'm no engineer, but forks can do 200psi, but in tiny tiny volume and they still blow quite dramatically.
2000psi in a downtube seems like it'll be 1. causing extra stress 2. needlessly risky.
Don't hydraulic presses crush shit at those pressues? and how the hell do you control it's output?
Chak
Someone in the comments on the Pinkbike article reckoned you'd need crazy heavy tubing to reach the claimed 150 bar.
That said, that will be 150 bar with an acceptable margin for error. I suspect that the frame probably isn't really safety rated for 150 bar, but could hold that much. At the recommended 20 bar, the tubing weight is almost certainly not super heavy, and if the frame were to suddenly depressurise, it would be a lot less catastrophic.
(Probably. IANAE)