You have mentioned your doubts about the term impossiblist before, SS, and maybe you a right.
But I think the origin was that in France the reformists called themselves the possiblists and the opposition took up the name impossiblist to distinguish that they were not going to compromise or make concessions.
Perhaps the term has had its day like others we have discarded. Communism is rarely used. The dictatorship of the proletariat never.
But you bring up an important point. Our use of language.
You and I plus others thought our aim could be better expressed in the statement “Where we stand” from 1973.
https://mailstrom.blogspot.com/2016/08/where-we-stand.html
And former comrade Paul Freeze thought we should drop particular words
https://socialismoryourmoneyback.blogspot.com/2017/10/world-of-free-access.html
And even our main video kids stuff refrains from jargon and the word socialism
Were they successful? I honestly can’t say.