I strongly disagree. I don't know whether he would identify himself as a communist politically, but it doesn't matter. Furthermore, I am entitled to analyze his ideas and classify them as I please. And as far as I'm concerned, he is arguing about fruits of labor being free in the typical “comrade” idealization from communism.
If at least he was actually doing what he preaches, one could be charitable. But actually he is just a goddamn activist, endlessly arguing about why the work of others should be free while he does zero work of value himself.
Every far-left friend I have had, who always touts some form of communism or sharing of resources, has been the one who systematically shares the least. And that is true both from a material point of view and effort/labor perspective as well. Hence my conclusion that they are assholes.
It seems to have hurt the sensibilities of his followers, but that was expected, and since they are assholes, you cannot expect them to be truthful.
By the way, political ideology is identifiable in genetics, so yes, it is absolutely certain that your political ideas correlate with how you interact with peoples.
1. Stallman has never, ever argued that fruits of labor should be free. He's always and only focused on knowledge: software, manuals, books for school, etc. In particular he's been against closed software of appliances and hardware you buy. If you buy a printer you should also own it fully and be able to modify it the way you please, which requires access to its software. He's never talked about services or physical goods being free.
2. There are psychological traits that can influence on a statistical level (very high numbers) political views. But this is just tendencies, it's not determinism.
Openness to new experiences correlates often with openness to change and experimentation on social matters. Neuroticism often correlates with sensitivity on safety matters. Agreeableness with tendencies towards egalitarian views. And all of that still matters way less than cultural background and many other things.
But extraversion or social skills, like in Stallman's case have 0 relationship with political views. In fact, by your logic and his traits, he should fall on the other end of the political spectrum.