It's not just the feed, but all wiki history-related functionality. I guess https://gitlab.postmarketos.org/postmarketOS/wiki/-/issues is the place to report this.
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Doesn't appear just broken, specially as the link you shown carries no account identifier (e.g. token):

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I've used it for a long time and it worked fine, then it broke around two weeks ago, all of a sudden.
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I get it. What I mean is that by the message, it appears to be an intentional locking down of the feed.
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