To correctly answer the question you’ve proposed we must first consider what is being meant by “dialectics”:

“Dialectics” as a philosophy, social concept, world outlook, etc., is our subjective interpretation of the laws in which reality works, therefore as it is the case with every “thing-for-us” it is a reflection created the human mind and consequently is depended on conscious beings capable of such complex thinking and necessarily has a definite beginning and a definite end.

“Dialectics” as the “thing-in-itself”, as the laws of motion of the universe, is infinite as time itself, for if time is absolute, which it is, it will affect every existing thing in the universe and it does so through “dialectics”.

So the “thing-for-us” called “dialectics” is not eternal and is merely our attempt at understanding the laws of the universe, and as such it is always going to be incomplete state and in a ever changing process of improvement towards the “thing-in-itself” which governs the motion of universe.

All that I wrote here is from my understanding of Engels’ “Anti-During”, where in one of its first chapters he explains the Hegelian concept of different infinites and time, which is pretty much what your question is centered around, so I’d recommend the read.

Thanks, that’s what I was looking for, crazy that I’ve never heard of it or of the author.

Thanks for the recommendations. I actually started searching for a critique after seeing how many of those philosophers call themselves Marxists or post, all the while covering with the most idealistic BS the advances that Marx brought to Philosophy and Sociology.