i don't know how reliable the frequent miler blog is, but I just noticed this post
https://frequentmiler.com/alaska-to-...partner-sites/
headline: Alaska to maintain class of service bonus in 2026 for flights booked on partner sites
... However, we have been able to confirm with Alaska representatives that there are no changes to the partner earn charts as published today — only tickets sold via Alaska Air Group (and ticketed on Alaska ticket stock) will follow the new choice-based structure.
The good news is that Alaska tells us that there is no change to the rate at which miles and status points are earned for flights booked through partner sites. The new choice-based earning structure applies to flights booked through Alaska and ticketed on Alaska ticket stock.
In other words, if you book a paid partner business class fare through AlaskaAir, you’ll earn based on the style you choose (distance, fare, or segments). If you book via a partner site, you’ll continue to earn distance-based points as per the chart above (in that example, 125% of distance flown in both redeemable points and status points).