I'm basing this assumption on what Nicko has said in the past, what Steve and Bruce said in the past and on this year's performances, particulary the Titanium Tart ones from the summer.
Nicko has stated in the past that if he feels like his performances are not up to standard, he will step down and persuade the others to get a replacement with his blessing. Steve and Bruce have stated in the past that the January 1999 - December 2024 live lineup is the last one. One of those happened and the other didn't, which leads me to believe that Nicko resigned himself.
The Titanium Tart performances from the summer were significant, in my opinion, because they weren't good. It was obvious at that point that Nicko's drumming ability hasn't improved a lot since the end of 2023 and the playing inactivity made him even more rusty than in previous years. The extended break between 2023 and 2024 could also signify that the band wanted to give Nicko time for his health to improve.
The fact that Nicko toured in 2023 is incredible. The fact that he finished the whole tour is even more incredible.
So, in short, based on past statements and observation of the performances, I assume that Nicko resigned himself.