Not so much the Delta, but the other two might be, the jc is probably foma, I'm sure someone will correct me if Im mistaken.

If it's heat fog, it may move from out to in, but if its fog from gamma radiation, it may not be. But... if the fog is even, its of little consequence you will be able to a certain degree compensate and print through it.

You can also add 5ml of a 5% benzotriazole solution (per liter of developer) to reduce the fogging.

Considering the cost of having film one can't trust, why anyone does this with old film, I just cant say.

If it's found film that has been exposed that might be a different matter.

Regardless, best of luck.