He didn’t post about it online.

Investigators tracked him down via license plate reader data. Once they had confirmed who the vehicle was registered to, they used an old social media post of his to confirm his place of residence so that they could issue a warrant.

The only social media post the article referenced was one that just said:

Haven’t posted in 3 years whoops. Well I’m a mechanic now, I live on James island with two of the best roommates and I’m enjoying life see yall in another 5 years.

That’s a pretty innocuous post if you ask me.