They were one of the oldest retails accepting Bitcoin from 2015. Indeed was through (fucking) Bitpay.
Last time I use it was in 2018 and I paid in BTC.
Now I see their website is in re-construction, so let's see if they will implement LN.
Discussion
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..
ok thanks, I replaced edeka with lieferando, just as a reference