I investigated this and can confirm the root cause: mentors.debian.net runs bookworm's lintian (2.116.3) while most uploaders now build against trixie (2.135) or sid. The version gap causes real confusion — for example, newer-standards-version is a Warning on mentors but doesn't even exist in current lintian, while out-of-date-standards-version (Info) only exists in newer versions.
I've submitted a minimal merge request to make the lintian binary path configurable via a LINTIAN_PATH setting: https://salsa.debian.org/mentors.debian.net-team/debexpo/-/merge_requests/226 Cheers, Juan
