The UX pattern I'm talking about it the one at the top of this comment thread.
This one:
"when someone tried to leave the site, bring up a popup to offer them a deal or otherwise encourage them not to leave"
This one:
"when someone tried to leave the site, bring up a popup to offer them a deal or otherwise encourage them not to leave"
In other words: in the Venn diagram of the two buckets - the measure of overlap is quite small.