That is right ^ ...no don't bother with a re seal one bottle fix all . Are you suspecting head gasket failure coolant lose ? Sweet smelling exhaust / lack of power oil coolant mixture
You can drop the front of the oil pan so you can get the timing cover off and that will let you put silicone in there to seal it.
However doing so will open up a Pandora's box of oil pan gasket and timing cover gasket. If you're looking to limp it along for a while, just hack it as is the plan. If it's something you plan to keep, I'm afraid changing the HG will be the only solution to a leak in that area.