Well... That's not entirely true. I mean, it depends on what they are going to do and how much freedom the "regional" creators will have. Creatively speaking and if we want to be optimistic, it could be the best move DC has ever done in decades.
I can't find the source in which this "production of regional material" is mentioned, so I have no idea of what the plans are or what they are going to do; and yes, in general superheroes are a strictly American genre. However, it's not that regional material based on American properties necessarily becomes TOO regional and barely understandable to American readers, or even not compatible with today's DC. Let's forget trite (and vaguely offensive) stereotypes like "Captain Spaghetti" and let's see what has happened in reality. In Italy, Disney has been producing regional material based on its characters since the 1950s, and it is still insanely popular. There are like, I don't know, 5 or 6 different Mickey or Donald series? In 50+ years hundreds of characters have been created by Italian writers and artists - I've read somewhere that today Italy produces 75% of ALL the Disney comic book material in the world. Even if from time to time there are references to Italian celebrities, 90% of such material is perfectly understandable to an American audience. Most of the Disney stories which are currently printed in the US are - in fact - translated Italian stories.
Something similar (not on the same scale though) has happened in Brazil. And let's not forget that Don Rosa created the definitive Uncle Scrooge story for a Danish publisher. Without Egmont, The Life and Times of Scrooge McDuck would have never seen the light.
Disney is not the only example. There are also stories which belong to strictly American genres which are entirely created by non-American creators. I mean, French Valérian and Laureline is pure space opera. Tex, published uninterruptedly by Sergio Bonelli Editore since 1964, is basically the definitive Western comic book and still sells a lot (200'000 monthly copies in Italy). There have been special issues drawn by people like Joe Kubert or Enrique Breccia. Nothing about its content is "regional" - it's basically John Ford Western, even if the directions are unusual from time to time. By the way, Sergio Bonelli Editore is about to publish some crossover books in which DC superheroes meet characters created by Italian writers (
https://shop.sergiobonelli.it/dylan-...atman-1007464/ ), so I guess that something is already happening behind the scenes.
Between the two extremes "just reskins of American characters" and "too regional to be compatible with DC" there are a LOT of different possibilities. The best comparison which comes to my mind is Spaghetti western. I am oversimplifying here, but after John Ford and the "mythical" atmosphere of his Western movies we had Sergio Leone; in his Dollars Trilogy he created an approach to Western which nobody had never seen before, but has become hugely popular ever since (think of Read Dead Redemption 2).
And - just to be clear - without the British Invasion of the 1980s, very few DC things released in the latest decades would be worth reading.
It's not impossible to imagine Franco-Belgian comics focused on sci-fi characters like Superman. Heck, I would be more interested in a Humanoids-style Superman series than everything produced by US DC in 30+ years. Or even a Superman story by Yukito Kishiro, even if I can't think of one single reason for manga creators to be interested in US superhero comic books.