Bullet points:
It was a reply to a GDPR request, not an unsolicited threat.
It did state that 'further legal action' could be taken, but context made it seem like a generic statement rather than targeted.
It also specifically stated the reason for ban was that Nalfey 'may have created or distributed' unauthorized software. It did not speak of use.
There's absolutely no reference to Github or request for takedown. My interpretation is that the statement about legal action was an artifact coming from generic communication. I found it very interesting that their documentation on the ban specifically said creating and distributing, rather than using. My interpretation would be that Nalfey was GMed for talking about making addons or telling others where to get them while ingame. Obviously, that's not the only possible interpretation.
Really, the biggest takeaway may be that GDPR allows banned europeans to get a little bit more info on their ban. Without more GDPR replies, it's hard to say if the language is always like that, but I'd be inclined to think it isn't. If the ban was for the use of tools, I would have expected it to say that. So, I'll admit that some of my assumptions from the last page were likely wrong. However, I do not think there was any legitimate legal threat made about the Github, nor do I think SE was even aware the Github existed.
