Hi Aaron,
we have the same Problem with WP 5.3.2 and 7.2-latest FPM, on one other Page with a Old Version WP 5.0.8 the Plugin works like charm.
The Debug of the Plugin on WP 5.3.2 just say:
2020-02-24 16:53:59 7401 -> SCHEDULED at Do, 20 Feb 2020 23:00:00 +0100 (1582239600) with options Array ( [expireType] => trash [id] => 7401 )
2020-02-24 16:53:59 7401 -> EXISTING FOUND – UNSCHEDULED
2020-02-24 16:53:39 7399 -> SCHEDULED at Do, 20 Feb 2020 23:00:00 +0100 (1582239600) with options Array ( [expireType] => trash [id] => 7399 )
2020-02-24 16:53:39 7399 -> EXISTING FOUND – UNSCHEDULED
We can provide you a Testuser, if you want to check the Plugin out.
Thx and BR