I'm not saying like at all. He hid his body under illusion, created the vessel he used to travel with Claudia and Terry, he made baby primal stone fly and brought the night, but... for great mage of all primal sources, he barely uses any magic to attack someone or defend himself. My understanding of this season is that he planned for his death there, so there was no need to show off too much, but what if he actually couldn't? I haven't read much of external media aside from animated series, so I'm not sure what exactly "fallen star" title represents exactly, but the light on his chest is dimmed since his imprisonment. Creatures with primal connection strengthen their magic in proximity of their main primal sources, moon elves during full moon, sun elves during sunny day...
There were no stars in Aaravos prison. We can see in season 7 that he's starting to glimmer a little during the night while ho look dimmed during a day, way more than in his backstory in season 6. He was trapped for 300 years in place completely deprived of natural connection to his main source of power (and all others, to be honest). I don't think that this wouldn't bring any consequences.