Trying to add that URL recommends older blogs by the same author, but they are discontinued, and adding the current one doesn’t seem to do anything.
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Looks like that site’s feed link is broken (it points back to https://glyph.twistedmatrix.com/). Fortunately the author says which blogging platform they’re using (Pelican) so one can reverse-engineer a feed location. Try subscribing to https://glyph.twistedmatrix.com/feeds… .