The team had slipped back in 2024 with the risks they had to take due to lack of wind tunnel time. Horner's text saga/internal war or not, the car development was hurt already. For Marko, it is just a convenient face saver.
The team sorted their issues out and that takes a lot of time - just see all around the paddock how well teams have done these regulations. Ferrari went to --- this year, McLaren were --- for 2 years straight and Mercedes haven't recovered from the zeropods.
Red Bull's technical team still managed to make a working car that won 8 races this year. Credit where due. It's not like Verstappen alone was magically winning. It took a good enough car that's close enough, good operational efficiency and of course Verstappen being the machine he is. Horner is responsible for this team. He will also have at least half responsibility for next year's car and full responsibility for RBPT.
Horner slipping is just a stupid argument. You can't keep winning but Red Bull did find a way every year of these regulations. 17, 21, 9 and 8 wins are pretty good given the resource limitation. That's the global picture.

