Works as intended but it misses an easy way to add websites to the whitelist with various options (i.e. domain, sub-domain...) as the free text field for a comma separated list is not very user friendly.
Looking at the github project, updates look mostly automated by the flathub bot and it looks like the flatpak source is always the deb file from https://get.geo.opera.com/pub/opera/desktop/<version>/linux/opera-stable_<version>_amd64.deb. Since https://get.geo.opera.com/pub/opera/desktop/109.0.5097.45/linux/opera-stable_109.0.5097.45_amd64.deb is available now, I would assume it's just a matter of time.
Petr has done some past commits. Maybe messaging him would help. Not sure.