This the twin to #96458, and the same reasoning applies.
If something is static it cannot be deallocated.

AFAICT, this clears subclasses of the static type, and doesn't deallocate the class.
The (class, subclass) relation for static types is an attribute of the interpreter not the class, so _PyStaticType_Dealloc needs to be renamed, at least.

_PyStaticType_Dealloc also allocates int objects, which is problematic during interpreter cleanup, as the MemoryError cache may be cleared first.