I am amazed that after already being busted once that he hasn’t been busted again.
They have bigger fish to fry (MW and FM pirates in the large cities) and plenty of other things to do with mobile vans than to be poised and ready to find and give the knock to HF pirates who are only transmitting for 45 minutes at a time and on an irregular schedule.
FCC enforcement is not what it used to be in "the bad old days" (1970s-90s). As proof, I submit the stories of some of the "hams behaving badly" (e.g. W6WBJ, "the
World's
Best
Jammer", some of the activity on 7200 KHz in the east, and so on) whose sagas go on for years and years but also stations like Ball Smacker, who advertise ahead of time when they will be on and keep to a regular schedule - making them completely predictable - and have been doing this for quite some time. In the olden days, even without someone making a complaint, I suspect that many of the low-hanging fruit would have been found and given a warning long ago. These days, it just doesn't seem to have the same priority.