The 2025 T&C still says you can book PD on any ticket stock, right? That info you are referencing is only for 2024 I thought.
FYI there are detailed lists of fare classes in the T&C for the 2025 rules. It is not actually really that different from how it worked in the past, the information is just confusingly presented.
There are a standard 5 buckets of earn levels for tickets on partner ticket stock shown on the main page with earning levels, and the detauls of which flight numbers are eligible and which fare class maps into which bucket is listed here:
https://www.alaskaair.com/content/mi...nascom-flights
Under Porter it says: "All flight numbers operated by Porter Airlines and booked via partner site".
So I definitely read this to mean that PD on non-027 stock is valid in 2025.
Edit to add:
9X (Southern Airways Express) is not on this list, so continues to only earn on AS stock, but they explicitly included that language about Porter in the 2025 rules. It's definitely worth asking someone from Alaska for clarification about.