The brown line represents weekly deaths from all causes of vaccinated people aged 10-59, per 100,000 people.
The blue line represents weekly deaths from all causes of unvaccinated people per 100,000 in the same age range.
I have checked the underlying dataset myself and this graph is correct. Vaccinated people under 60 are twice as likely to die as unvaccinated people. And overall deaths in Britain are running well above normal.
I don’t know how to explain this other than vaccine-caused mortality.
The basic data is available here, download the Excel file and see table 4.