Whilst true, that ultimately is of little relevance. DCR has shown that the powerpod, for example, gives very comparable readings to a direct force power meter when cycling, so how the numbers are created is actually not hugely important.
Moreover, your direct force power meter is just a strain gauge which measures torque, and then “some algorithms” convert that to a power number, using accelerometers.
Stryd have also shown that their numbers are in line with force plate measurements.
Your statement effectively means running power meters will never be a thing. Whilst DCR is still saying they’re probably “not there yet”, he says anyone claiming they won’t be, in the same way people said the same when cycling power meters first came out, is equally deluded.