[shanghaiaway]

It's a leftist publication, of course it's not reactionary. It's Marxist, of course it uses obscure language.

[randallsquared]

They meant "reactive".

(I also thought that "Reacting to the past rather than anticipating the future, not predictive." was one definition of reactionary, but not according to https://en.wiktionary.org/wiki/reactive and https://en.wiktionary.org/wiki/reactionary ).

[uxp100]

I thought so too, but at the very least it is confusing in this context.