[DE / Germany] Is eticketsy.com legit? I am unsure if the tickets I got there are valid

A user purchased tickets for an Anna Lapwood concert in Bonn, Germany, from eticketsy.com, a site not affiliated with the official ticket store. The tickets were received as PDFs and Apple Wallet entries with row/seat numbers and the user's name, but no mention of the original event organizer. The user is uncertain whether the site is a legitimate reseller or a scam.