The giant lego set of 15,000 pieces that is a F1 car is too great for any one person and a pen and paper to take all the credit for.
In a way I feel like the 3 engineers should really have gotten a shout out somewhere in the puff piece.
This isn't a fair characterization — while I agree that one person isn't responsible for the whole assembly — Newey does have a gigantic drafting table in his office: https://www.youtube.com/watch?v=8VXJtrz1m9Y
https://www.eandvgroup.com/the-cocktail-napkin-hall-of-fame/
They've announced many new parts for this weekend's race; we'll see if AM can close the gap to the top teams with a Newey-trained (?) aerodynamicist who's not Newey and (presumably) has no access to him.
His success there has been, well.. less than many would have hoped.
Since he came from that era where ground effects played a role in F1 he probably focused on the bottom of the car this year (floor) hence they had less issues with bouncing than other teams.
You will notice he attends most races - he sits on the pitwall.
This has been the way it goes for a long time now. The engineering teams that work on f1 cars are huge (though less so now with the cost caps that came in to effect this season) so no one knows every aspect of the car in full detail. Same as with any large engineering project really.
What someone like Newey brings to the team is working out how the whole thing fits together, identifying the most productive areas of the car to work on (to find more speed) and troubleshooting issues with the car that come up through the season.
Add new tyre compounds to the mix as well.
Merc is not so dominant this years compared to last year because they got it wrong for their 2022 car while Red Bull and Ferrari was out of the gate competitive.