Translation:
Rival teams have begun trying to develop their single-seaters in the direction taken by Red Bull, but they accept that reducing beam wings is complicated because of the amount of downforce they provide to help stabilize the rear end.
Red Bull's technical director, Pierre Wache, says there is no deep secret in what his team has done, and that it is surprising that rivals have taken so long to figure out something that, instead, his team has been doing since the start of the current ground-effect era.
"The crazy thing is that people are talking about it two years after we introduced it," Wache told Motorsport.com. "We had hundreds of tests by the FIA to see if we had used a trick or whatever, and people [even recently] don't understand why on high downforce tracks the advantage disappears. Okay, that means they haven't been able to figure it out yet. And that surprises us a lot."
Speaking about this advantage realized and maintained by Red Bull was, in an accomplished manner, Andrea Stella. The McLaren team principal pointed out that, in high probability, this advantage of the Milton Keynes team will remain for some time to come.
"They seem to have been pursuing their concept for quite some time. I think they are taking advantage of the experience they have gained in developing this configuration, and I think that has become evident as time has gone on."
"I think all the teams are now trying to understand what can be exploited by developing the same style, the same kind of direction introduced [by Red Bull]."
I am a Qualified Automotive engineer, following F1 since 1986. Got a friend that is race steward in F1, and a former colleague showed up as "control engineer" in Alonso's F1 team (Alonso WDC). I visited 3 F1 circuits. I know more about F1 then any highschool American.
Also, read this.
https://athletistic.com/formula-1/128017.html
And read this:
https://www.gpfans.com/en/f1-news/109229/adrian-newey-red-bull-f1-ground-effect-project/