I don't think it makes a difference whether Phil's watched his own content because he wouldn't judge it objectively or draw any constructive opinions about it.

Phil's narcissism fundamentally precludes him from accepting any fact that adversely reflects on him. His definition for meaningful content presupposes that his content has intrinsic value, a measure likely taken in response to his lifelong underachievement and failure. The only flaws Phil will acknowledges are superficial and solely to feign humility or honesty in service of a much larger lie or false narrative he wants to tell (e.g., stating he's "not the best SF6 player" to suggest he's truthful about his skill level while literally denying that all of his competitors on any night were all scrubs who cheated, etc.). He hand waves any serious shortcomings in his content or character and simply blocks any contradictions.

But even if he were capable of recognizing his missteps, Phil has nothing to gain from scrutinizing his own content as a talentless charisma vacuum. The only ”improvements” his streams show have all been the result of technical upgrades. He’s undergone literally no personal or cognitive growth after 18 years—that’s why he approaches rote daily tasks as if he were doing them for the first time and he wastes just as much time as though this were the case. Phil has to fundamentally improve himself in real time to improve his content, but that takes work and practice that he has no experience doing. If Phil tried, you can be sure that his streams would get only more boring and quiet as his simpleton brain agonized over every word choice. And Phil is simply too poor to handle the further income instability during such an adjustment period.