It seems turning on reader mode displays the gdpr waiver, but then if you refresh the page it shows the article. I'd be interested to know how they managed to

It seems turning on reader mode displays the gdpr waiver, but then if you refresh the page it shows the article. I'd be interested to know how they managed to achieve that. The waiver doesn't seem to appear in the html source.. so I'm not sure where it is coming from and it is now too late in the day for me to investigate it further..