if you go to the full changelog on the blog and click on the "retired" button, the url will have type=deprecations as the parameter.

It's a holdover from previous posts where there were more clearly defined deprecations.

but yes, in this case it's more of a behavioural change of defaults, so they just picked the closest vaguely mapped retired/deprecations tag.

1: https://github.blog/changelog/?type=deprecations