Could be-but in my case not now. How do I know-we put a new roof skin on with new seam seals and it also got caulked at both ends. BTW: it is not the squirter and the sunroof is completely out of the car.
I have no idea where it is coming in except possibly around the taillights and those seals were good when we took the car apart. Could be, as suggested, the actual hatch seal is the only part left from the car that I did not replace. Makes me wonder