Edit: Yeah they do. There's no excuse for goofing this up.
"We didn't understand the licensing!" isnt usually an incredible claim, but it becomes so when it's being made by a company that manages software licensing compliance.
That's a hell of a caveat though. That is basically the entire license.
Its like saying you are allowed to kill people minus that whole law about murder. Well like obviously. You are allowed to do anything minus the rules that forbid you from doing the thing.
Generally speaking, open source ecosystem knowledge is not something that shows up in job descriptions, interviews, or regular training for non-technical staff in most software companies. Hopefully that will one day be the case but until then there is a high likelihood that misleading statements can be made accidentally.
Every company of non-trivial sizes will eventually hire someone who is a bad hire.