This is incorrect entirely. Megatron was a gladiator who wanted to take over Cybertron and turn it into a massive ship and go around conquering worlds. The deceptions are all a hyper militarized fascists type and are meant to be depicted as such. That's why they all take the form of various military vehicles. The whole reason the war started was because of energy shortages and the most militarized forces began fighting amongst themselves until Megatron came in and formed the deceptions and hatched his plan to conquer Cybertron.

The Autobots that resisted the decepticon are workers. They have always been at a disadvantage because they, being a worker class, lacked the kind of weaponry that deceptions had. This is why they are almost always seen as working vehicles. Prime always pushed a narrative of seeing all life as equal and such. Even their history, Prime was the last descendant of the original "god" like entity that created the Autobots and he decided to be reborn as just a normal autobot and live as an equal with the rest of his people.

This all being said l, neither side can really be seen as fascist or communist. However the narrative is the deceptions are the hyper militarized, warhawk factions and the Autobots are primarily made of the worker cast resisting them.