[jlg23]

> How does UTC jumping around affect this? If a leap second is removed it doesn't mean you've waited 0 seconds

The OP did not make this claim. He said that waiting 1s does not necessarily increase the Unix time by one second - not the other way around.

Or how my highschool math teacher put it: Every time it rains, the street gets wet. But not every time the street is wet, it rained - maybe my dog just took a leak....