Neomarxist on its own has been used by others outside of him, but even then it's as vague as tankie. I've seen it applied to Zizek for nominally being a Marxist while having a bunch of pro-European and conservative takes, generically to Eco-Marxists like John Bellamy Foster because they're rediscovering part of Marx, and by reactionaries because it's scarier than Marxist if big words scare you.