Just to make this kind of confusing story less confusing—the Pinboard guy prints valid invoices (in order to be legally compliant, and because he's "not a totally evil guy"). Someone (from Germany) asked him to add Company Name to the invoice, and he replied by saying "just edit the HTML to add whatever you need".

https://twitter.com/i/status/1192182812121583617 The actual tweets probably explain it better than I (and the parent comment) can.