That wasn’t intended to be a meme. It was to show that in time more misgraded cards are discovered and where 2xx certs are older it goes hand in hand that more misgraded 2xx certs will have appeared. PSA didn’t suddenly have a complete change of heart between 29999999 and 40000000 (or the brief stint they did grade Pokémon as 3xx).
In terms of credibility I’ve been grading with PSA since around 265xx and can tell you that I’ve experienced more questionable grades as 4xx than I did with 2xx (and the last PSA return I had was in the 45xx range, so I’ve experienced almost as many 2xx certs as I have 4xx certs). Also in terms of credibility I’ve been analysing PSA’s population data since 2019 and have not noticed any change in the numbers of PSA 10 grades awarded.
You can chose to believe that certain certificate ranges are graded better, but I don’t believe there’s enough data to justify that belief and think it’s nothing more than speculation - speculation which, as mentioned in the post I linked you to previously - started when people were trying to upsell their 4xx certs when the market had a high supply of 2xx certs.
Whether you believe that TCA Gaming and Scott are more credible in this discussion is your call to make and I’m not going to dispute that, but I will say that ultimately it’s important to come to your own conclusions. Don’t just buy a card because it has a high grade, buy a card because you believe the grade is justified. That isn’t new advice, but it’s advice a lot of people don’t follow - case in point: the 4xx cert Master’s Scroll which PWCC sold recently.