It's not
recent as in last week, but AS changes to a distance-based chart happened some time ago, in 2017.
https://thepointsguy.com/2017/01/max...d-award-chart/
The devaluation where 50k is the maximum AS Y award price happened in 2018.
https://onemileatatime.com/alaska-mi...chart-changes/
The worst news is that we’re seeing a big increase in the range of pricing for some markets, so when there’s not saver level award availability, you can expect to pay significantly more in some cases.
(emphasis added)
Basically, if you want to fly at absolute peak time, like, say, when SEA and ANC are in the middle of tourist season, you will be paying more miles.