As mentioned by
@Mal, it's looking increasingly likely that the LAW/TSU swap is a foregone conclusion for Suzuka and whilst many would view it as a poison chalice, the reality is that TSU doesn't have any choice in the matter. I've read various opinion pieces suggesting he should decline the offer if asked to make the switch, but the reality is that he's still a "Red Bull driver", which means that RB can choose to put him in whichever car they want.
It's true that if he moves to RB and fails to perform in the machinery, then his time in F1 could be coming to a rapid end. At the same time, the fact remains that he's been financially backed by Honda to date, so with Honda pulling out of Red Bull + VCARB at the end of the year, it's almost certain that TSU would lose his drive at VCARB anyway. Honda have made it clear that they're slowly moonwalking out of the room when it comes to their financial support of TSU and that he'll need to start looking after himself into the future. That also speaks volumes given Honda are switching to Aston Martin and could have easily taken TSU with them, but AM already have 2 drivers locked and loaded for 2026, plus they have Felipe Drugovich as their reserve driver and Stoffel Vandoorne as their alternative test and reserve driver. Essentially, there's no room at the inn for TSU. This pretty much leaves Cadillac F1 as the only remaining option, and you can be (reasonably) sure that they'll look to sign an American driver + someone from the F1 paddock with experience who can help them develop the car and mentor their team mate in the team's early years.
As well as TSU has been driving of late, the harsh reality is that with virtually all seats already spoken for in 2026, this is a make-or-break opportunity in RB that may well be TSU's only real chance to show that he deserves to be considered as a driver worthy of remaining on the grid and to try and secure a future beyond 2025.