Yes, although it has plenty of clay and plans to just transition to another supplier when that runs out. I think the risk has been blown out of proportion.

https://www.nytimes.com/2023/11/20/movies/clay-shortage-movie-animation-aardman.html

It would seem so

As far as I can remember, they said that they will be able to finish the film already in production with what they have or bought. So it seems more like the last before clay shortage, hopefully not the last at all