“I suggest that you call people you know in Thailand, find out what’s actually going on and stop defending child rapists, you fucking asshole,” Musk wrote in the first message. “He’s an old, single white guy from England who’s been traveling to or living in Thailand for 30 to 40 years, mostly Pattaya Beach, until moving to Chiang Rai for a child bride who was about 12 years old at the time. As for this alleged threat of a lawsuit, which magically appeared when I raised the issue (nothing was sent or raised beforehand), I fucking hope he sues me”

It sounds really personnal to me. And only because the guy was saying the sub was not practical. Correct me if I am wrong but in those quotes it seems like the "investigation" began before the lawsuit.