ZB:
No. That teshuva from Rav Moshe Zatza”l is, of course, in agreement with the gedolim’s view of the heresy and idolatry of Zionism.
He simply stated that the Zionist flag is not technically A”Z. This happens to be very convenient for all of us given the large number of shuls that unfortunately have this flag in their sanctuaries, R”L. That the flag is not A”Z doesn’t make Zionism itself any less idolatrous.
While on that topic, he also doesn’t exactly praise the flag’s inclusion in the sanctuary either, for obvious reasons.