I have seen (and helped diagnose) a car computer where the sensor was fine and the computer input was bad. Rare though.
That is super rare, but mechanics like to blame the computer and replace them willy-nilly. I've never seen a bad computer that wasn't physically damaged.
As for an ohm meter damaging the sensor, seems rather unlikely. About all that could happen (theoretically) is that the ohm meter might push too much current through the device, burning out a coil. In which case the resistance would then read VERY VERY high, not low.
Maybe they used a megger?
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