The website in your blog does not exist. The correct website of the chain's online shop is https://www.edeka24.de but they do not accept BTC (and doubt they ever had).

FWIW, Lieferando.de (known as Just Eat/Takeaway.com in other countries) accepts Bitcoin/LN -- through Buttpay ☹️.

Chances are if you're on a VPN you're asked to log in/register a Bitpay account. Although I had occasions where I just had to provide an email..