Anecdotal evidence suggests that Portland has been extremely lax about towing during parking pans for several years now; basically an unofficial "go-easy" policy growing out of the pandemic.
I would be willing to bet that this permissiveness has something to do with AirBnB hosts complaining about their customers being supremely inconvenienced.
So it is funny to hear the City tell TV news that compliance is not where they would like it to be when a lot of drivers (and in the case of out-of-towners, the AirBnB hosts who should be educating them) have grown accustomed to the City not being serious about enforcing parking bans.