There is confusion in that thread.

People seem to be complaining that they can’t access Washington Post articles, but in 2024, when that thread was written, The Washington Post was not included in Apple News Plus. It joined in 2025 (https://9to5mac.com/2025/09/29/apple-news-just-added-the-was...).

What you could do before that was register your Washington Post subscription, if you had one, with the Apple News app, then you’d be able to read full Washington Post articles - perhaps this was confusing the forum posters?