I think in "left wing" circles, CPGB are not seen as the high priests of socialism. I know the Socialist Workers hate them. It's all very "People's Front of Judea" vs "Judean Peoples Front " (for Monty Python fans). Historically this has always been in thing on the far left - right back to Spanish Civil War and further back.
Anyhoo, it's quite bold of CPGB to stick their neck out explicitly on this because it may spark discussion on the left - which the left doesn't want.
I knew for a long time that CPGB had this position but, like GB News, because they are batshit on lots of things, I don't set much stock in it.
Other than an excuse to get the popcorn out.