Next year he will not race the Vuelta again.
If he is targetting PR, it's obvious his schedule will be similar to this year.
Yes, he is targeting PR. But that does not mean he will not do the Vuelta. If he has a proper team (that is at least on par with Visma, if not better), and if he does not crash and catch cold (this year it looks like he did) he will be significantly less exhausted after the Tour.
Without checking or knowing—isn't next year's WC circuit also good for him?
They are. At least the RR courses. But if he wants to win the WC ITT, there will never be a better (hilly) course than in Rwanda. Next year, the TT will allegedly be on a motor racing circuit (flat), in 2027, it will be similar to Zürich TT course, and 2028-2029 will be surely flat (RR too). Pogacar wants to win everything possible (including WC TT) - and this is his best (possibly only) chance to win the WC TT. It would be too hard to ride it immediately (one week) after Vuelta.
Next year, he will only target WC RR after Vuelta. So IMO it means Vuelta was always likelier either next year or in 2027 (in 2027, the WC comes early, end of August/beginning of September, which means Vuelta will take place AFTER the WC and Pogi can contest Vuelta without compromising his WC goals).