allow me to introduce you to PopUpOFF, for popups like this on websites. It's very effective at sending shit like this to the shadow realm.
won't be able to help on a third party app though, but if popups like this annoy you like they annoy me, figured you'd be interested. Could probably work on their mobile site.
uBlock Origin blocks ads, it generally doesn't block cookie popups (and if it does, only on the initial load). This will nuke any overlay that appears during, or after the page loads. So cookie popups, newsletter subscription begging, all that shit goes away, even the ones that wait until you start scrolling.
So, consent-o-matic isn't supposed to block this. It's supposed to reject the shit automatically whenever it pops up to save you time and frustration. Sorry if my previous comment wasn't very clear about the difference here.