Office workers approving applications are not the only people who will see these. Users may include (disgruntled) neighbours, and anyone who will at some point need to know what the measurements on a site are to do their job correctly, legally, and/or safely. The possibility for misinterpretation is clear, and the fix is trivial.

Your interpretation of the disclaimer may be correct, but the phrasing "This is not a Legal Survey, nor is it intended to be or replace a Legal Survey." is excessive for that purpose and makes more sense if it's meant to head off complaints from the engineer's association.