"wrong" is a bit of an over-the-top accusation here. when he says all the amyloid drugs have failed, does he mean that they failed to clear out the plaques, or that they didn't cure the alzheimer's even though they cleared away the amyloid? If the former, then he's really being unfair, if the latter, then he does have a strong basis for the assertion, but it's still a little over-the-top.