Oh, I'm aware of that communism terminology debate. But that's the system that exists in mainstream knowledge. Any communist or socialist party today will tend toward this more than the ideal one you mention.

The way I usually reason about it is as follows:

In terms of the political system and term promotion

Any effort to promote the term will now be contaminated by the tyrants' view of what communism entails. You will have communists supporting the Soviet Union and its gulags, Mao and his massacres, Fidel's tyranny, Chávez's destruction of the economy and Maduro's oligarchy.

The term has been coopted by these parties and groups of people, and promoting "communism" or "socialism" per se in a systematic way will always lead to empowering this collectivist ruling class, resulting in similar results.

In terms of the concept itself as a viable strategy

(sidenote: I have to confess on this part that I haven't read much about what you say, so I'll have to read up that "alternative branch" of communism. I'll have to categorize your books by author and title, because "this book" is not very descriptive lol.)

When you see 100 attempts, and all result in failure, and people keep promoting it, it kinda smells of self-destructive delusion.

I have this analogy that I always think about, which is one of a magical pill that can cure any disease, but any time someone drinks it, it kills the person, and everyone then says "it must've been the wrong formula" and keeps trying again and again, killing everyone who drinks the pill for generations, and shutting down anyone who questions the legitimacy of the recipe.