If that doesn't make me a buddhist, I'm not sure what would :}
Zen is certainly a 'back to basics' movement; but you're quite incorrect so think that zen is separate from historical traditions of buddhism. The buddha sat Shikantaza just as we, all the 'fluff' came later. We are perhaps a 'back to basics' movement, but one that has a several thousand year lineage. Unless you feel Bodhidharma was a dubious modernist? :}
I say 'my practice' as I do not wish to speak for others even inside my group, let alone buddhists as whole.