People can make mistakes without "lying", and it's perfectly fine to correct a mistake by adding a note at the bottom. Indeed it's arguably more helpful that way, since a new reader will better be able to understand the context of the replies.

To bombard someone with the word "lie" crosses into incivility (rather aggressively, as I read it), and also breaks the site guidelines by not giving the benefit of the doubt. Could you please not treat others like this here? Instead, assume good faith, as the guidelines ask.

https://news.ycombinator.com/newsguidelines.html

I respectfully disagree. In cases like this, if the user made a honest mistake and then issues a correction, it should be in line, at the same level as the mistake - otherwise, it's exactly like when a newspaper spreads a false accusation in the first page, and then a retraction at page 7. What sticks in the mind of the casual reader is the first untruth, not the truth that follows.

By the way, even the correction below is a untruth, because only a few other EU countries have similar laws.

Edit: you both are right

In this context, indeed it isn't. It would be just as wrong to write "US law mandates..." when the law in question is in fact only Texas state law. I.e. "European law" != "a law somewhere in Europe".

I'm saying that writing "European law mandates that you have an "impressum"" is a lie.