Lintian cannot parse the Depends field for the given autopkgtest.
Please double check that dependency the syntax is correct.
Note that Lintian has a whitelist of known "special" dependencies permitted by autopkgtest (e.g. @builddep@). Lintian does not accept these as a part of an OR-clause.
If Lintian complains about a new special "@"-dependency, please file a bug against Lintian and have it added to the whitelist.
Refer to https://salsa.debian.org/ci-team/autopkgtest/tree/master/doc/README.package-tests.rst for details.