Thank you for the answers.
I think some specifications from the suppliers are misleading, therefore I’m still struggling to clarify for myself:

@aubicat: it seems that resistance for Elite Turbo Muin B+ is based on a propeller rotating in a fluid. That would mean that its resistance increases with the increase of rider’s pedaling cadence – like riding on flat roads. But for a real climb, the resistance increases for the same cadence and the same gear – and I think Elite Turbo Muin can not do that, since it is just a propeller rotating into a fluid and its resistance can only vary with cadence, for a given gear.
Am I wrong?

@eric1971 and mvnsnd: About Tacx. should I understand that, once they have electro brake or electric motor brake, they can simulate climbs (e.g.: to increase resistance at the same cadence and bike gear, according to a slope that is simulated by the computer or by online systems such as Zwift)? Is my understanding correct?

No problem to search “overseas” – I am located in Europe.