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The website is being hugged to death, but archive.org has scraped the PDF: https://web.archive.org/web/20210302215033/https://eprint.ia...

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This is a different paper.

The linked one is: received 1 Mar 2021

The PDF is: work in progress 31.10.2019

No, that archive.org link is a valid link for the PDF of the linked paper - if you click through to the PDF from the HN link, it's identical, including the "work in progress 31.10.2019" stamp on the first page.

Why "work in progress 31.10.2019" appears on something supposedly submitted 1 Mar 2021 is an open question, but they do point to the same thing.

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