We've just booked this too. Significant birthday in November.
Sean from Drowned in Sound went a few years ago and wrote this review... https://drownedinsound.com/in_depth/4149611
Gabi hinted they were playing Primavera in 2023. Plus... https://www.nme.com/news/music/watch-portishead-perform-live-for-the-first-time-since-2015-3216974