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The article says:

A follower of the philosopher Karl Popper would object: isn’t this just foundationalism in disguise? … Popper showed that’s impossible: any justification needs a deeper justification, and that one needs another, so you either chase reasons forever or stop at one you can’t defend.

I didn’t read the entire linked page, but based on a word search for ‘regress’, it attributes the infinite-regress problem to Hans Albert, not Popper:

[Albert] argues that any attempt at justification faces a three-pronged difficulty that is traceable to Agrippa: One alternative leads to an infinite regress as one seeks to prove one assumption but then needs to assume some new one…