This would imply that minority groups make up 126% of TV actors. Even if that number weren’t mathematically impossible, reasonable people would agree that we’re not even close to even say 90% representation of minority groups on US TV.
For example, Zoey's Extraordinary Playlist gives the impression of high representation of minorities in tech (Sprqpoint is extremely DEI friendly being a woke silicon valley tech company, but even the main character's non-techy neighbor is a black genderfluid woman dating a gay black man).
The Dragon Prince gives the impression of high representation of minorities as well (with 1 main character and his kingly father black, 1 main character having gay parents, the rulers of the neighboring country being lesbian, etc).
I'm not saying that's wrong, just that minority groups don't need to make up 126% of TV actors in order to be overrepresented in main cast.
Heck, even outside of media, look at the Supreme Court. Soon 2/9 justices will be black, which is 22% of the court - an over representation of the black population. Again, not that I have a problem with that, just that DEI efforts can cause high visibility groups (such as a TV show's main cast) to be overrepressented by minorities.
And even as far as the Dragon Prince is concerned, it's interesting how you mention it as overrepresentation when much of the diversity is relegated to secondary characters. Callum, Rayla, Claudia, Soren and Viren are all white (elves are in some ways minority coded, but the British accent makes that remain firmly in the realm of coding), and seem to be straight and cisgender.
I personally love stories with "overrepresentation" - and not only just to make up for a massive history of erasure and underrepresentation. It makes me so happy to hear people saying "I usually don't feel seen, but THIS character, they look/sound/act like me!" Honestly, as a gay man I still don't feel especially seen - and as far as gay characters I feel connected to beyond just that, it's pretty limited. I can think of maybe... 4 main characters? And they're all in the past few years.
Another reason why this "feeling seen" thing can matter to people is that stories can give people a template to imagine their own life. If I see a gay couple I can connect to, it becomes easier to imagine my own future - what my family may be like in the future, and what kind of person I might be in that relationship. And while it's absolutely possible to think of those sorts of things via straight representation, or just brainstorm separately, for me there's something extra to seeing it in action.
For what it’s worth I don’t watch shows/TV, yet I’ve heard of both umvi’s examples but neither of yours. I suspect you might be overestimating their influence.
"‘Euphoria’ Is the Most-Tweeted TV Show of the Decade (So Far)"
https://variety.com/2022/digital/news/euphoria-most-tweeted-...
and
"‘Abbott Elementary’ Is No. 1 Most-Tweeted TV Comedy of the Year to Date"
https://news.yahoo.com/abbott-elementary-no-1-most-171433284...
Also this https://www.imdb.com/chart/tvmeter/?ref_=tt_ov_pop list has Euphoria as #2 (formerly #1), although to be fair Abbott is not on the list, and I'm personally not familiar with Pieces of Her. So fair enough, might be overestimating for Abbott - but it is on ABC so perhaps relevant to average people. And of all of these shows mentioned, I've only seen The Dragon Prince - I'm only aware of the other ones via discussions.