Is this a "nonsense" evaluation tool, this Wave Report?

See for yourself: http://wave.webaim.org/report#/http%3A%2F%2Fforum.avast.com%2Findex.php

Any to comment.
What for instance is meant with “contrast errors” - a bogus term?

polonus

Seems to me that the generator cant handle modified colours or colours that are not in it’s database :-\

Not an error as such, just a warning of low contrast.