The links that are failing according to Picard are for 1200 px thumbnails. That size doesn’t exist: https://ia800201.us.archive.org/6/items/mbid-6152f091-665d-4926-855c-d2565bc13662/mbid-6152f091-665d-4926-855c-d2565bc13662-12605218014_thumb1200.jpg
Perhaps you could try with the other sizes and see if that works?
I’m not sure why this size is missing. It may be that it will be generated later. It is done by the Internet Archive instead of MusicBrainz so there is little that can be done from this side.
See also Warning: The Cover Art Archive is currently experiencing difficulties and https://tickets.metabrainz.org/browse/CAA-99