The domain name is up for purchase ($9999.99 according to my registrar), so it looks like it’s lost rather than just temporarily parked for a slightly overdue bill.
Luckily the site was recently backed up by the Internet Archive and the archived All, gpx, and csv links seem to work.
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The GPX file seems to be truncated at 1MB, but the CSV file seems to have more entries.
I imported the CSV file into a Google My Maps, then exported KMZ from there into GaiaGPS for my own use.