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The difference is in the purpose behind the temporary death. Revival Loophole is for when the "death" is necessary in order to fulfill some prophecy, or meet some condition for a further action. The death is contractually required (for sufficiently vague values of "contract") and the revival exploits a loophole in the "contract".
"We have to throw you into the shark pool to appease the god of the sea. But we don't have to keep you from climbing right back out before the shark gets to you" sort of thing. It's taking advantage of a loophole via a temporary "death"
...if you don’t love you’re dead, and if you do, they’ll kill you for it.
They seem to have very little in common aside from coming back from the dead. I'd assume that was why no one noticed. They could maybe get a related to, but they aren't the same thing.
Reality is that, which when you stop believing in it, doesn't go away. -Philip K. Dick
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Courtesy link #2: Flatline Plotline.
Somehow nobody noticed the similarity when Revival Loophole was going through YKTTW. The only tenable distinction I can see is that the description makes it sound like Flatline Plotline is required to be voluntary, but even that's not really borne out by the examples. There's a decent amount of example overlap.
132 is the rudest number.