They really say that? And it's not even April 1.
I don't get that at all. Reassembling hardware in wet epoxy? Sounds like a nightmare. Even assuming the result is watertight, it sounds like a forever sort of thing to me.
One nice thing about any flexible caulk is that should you ever want to remove the hardware, all you have to deal with is some bolt holes, the rest of the deck underneath will be unscathed. If I was shooting for something that I wanted forever, I'd look at 3M 5200 first.
But really, as baboon said caulk or butyl works well.