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> I think PR https://github.com/python/cpython/pull/28674 has resolved this issue.
You're right.
_threadmodule.c now uses _PyDeadline_Init() which calls _PyTime_Add(), and _PyTime_Add() prevents integer overflows; Extract of its implementation:
// Compute t1 + t2. Clamp to [_PyTime_MIN; _PyTime_MAX] on overflow.
static inline int
pytime_add(_PyTime_t *t1, _PyTime_t t2)
{
 if (t2 > 0 && *t1 > _PyTime_MAX - t2) {
 *t1 = _PyTime_MAX;
 return -1;
 }
 else if (t2 < 0 && *t1 < _PyTime_MIN - t2) {
 *t1 = _PyTime_MIN;
 return -1;
 }
 else {
 *t1 += t2;
 return 0;
 }
}