In the abstract, there's nothing incoherent about using others' technical vocabulary with different meanings. But:

1) You are misleading yourself if you think you are communicating effectively with them.
2) Your statements about their positions will make no sense to them.
3) It comes off as quite arrogant - essentially you are asserting you know better how a concept works without even attempting to justify the assertion (or even noticing that such an assertion is necessary)

If Eliezer says he is a reductionist1 and you say he is not a reductionist2, you haven't done anything particularly clever or praiseworthy.