He probably remembered doing that would expose his entire alt ring and decided to just keep them to shitpost and scam
Or he probably had nothing and they were just empty threats. A lot of scammers feeling indignant will resort to such childish methods, which never improve their situation. If theyfor oncelogically thought it through, they would realize that it was pointless to even send such a threat.
Especially one that would not affect the intended parties.