Way to overreact there.
One, the source of this information is highly unreliable; taking it as truth without any independent confirmation is like trusting Republicans to paint an accurate picture of Democrats.
Two, this is an action undertaken by CDProjekt, not GOG.
While both are anti-DRM, neither have ever said they were "cool with piracy". All they said about it was that DRM was not an effective means of preventing piracy, which is why they don't use it.
I don't know why that makes them "cool with piracy". Nobody is "cool with piracy" except pirates (i.e. self-entitled assholes who think they have the right to enjoy someone else's work without having paid for it).
Personally, I don't like DRM, but I like pirates even less. If companies managed to invent a way to deter piracy without making life more difficult for legitimate customers, I'd be all for it. Unfortunately, I don't think IP tracking is it, considering its unreliability.
That being said, we don't have any actual reports of innocent people receiving warnings to pay up.
Considering the source, it's highly likely that the German person who reported this WAS a pirate, so CDProjekt at least managed to target some of the right people.
And frankly if an innocent person receives such an e-mail, they're far more likely to delete it and flag the the sender as a spammer than to actually pay up.