At a quick glance, this commit changed the implementation of
‘tramp-archive-autload-file-name-handler’ and might be missing an
else-form.  This causes the autoload handler to return nil when
‘tramp-archive-enabled’ is nil, and, at a slightly longer glance, for
some file name handlers this is wrong and an error.  The attached patch
changes ‘tramp-archive-autoload-file-name-handler’ to always call
‘tramp-autoload-file-name-handler’, setting ‘tramp-archive-autoload’
appropriately.  This may cause a regression, though, of bug #48476 [3]
(“Emacs hangs with 100% cpu if started within a current directory that
has a name ending with ".tar"”).  I have not tested that or spent time
on understanding that bug.  Maybe you still remember enough details of
the bug to judge this.