This is a violation of the regulator guidance for the ePrivacy Directive. So I wouldn't trust anything on this site when they themselves aren't compliant with EU directives and regulations.
Not true. You don't have to consent to set a cookie. It depends on what the cookie does. Gdpr actually doesn't care about technicalities like cookies, but about privacy. So if you achieve the same tracking using other techniques (like Etag) that needs consent as well.
Law experts don't code webpages. But this is embarrassing nevertheless.