It's not refueling anyone there at that altitude. It's in the middle of Miami departures at that altitude. The R designator in the type implies it's a recon platform off some type - not radar but ELINT maybe. Monitoring everything near Mar-a-lago. Could be looking for threats.
Look at it form their perspective…
Squatting in a hut in Central America scavenging and trading for food a few times a day. Hearing about those that have been to the US and the riches to be had for free.
Plan:
Sell everything to pay coyotes, food for trek, and any other costs that have to be covered to get to US border.
Look for caravan to melt into and get freebies for the trip
Arrive at border and if you get inside, disappear.
Get with friends, family, and "immigrant friendly" orgs
Get fake SSAN & employer that doesn't care if you're illegal.
sign up for medicaid, welfare, food stamp, and any other freebies you can find.
At tax time, file using fake SSAN, create a dozen or ore dependents, claim everything possible in return
Get massive refund plus more
Send $$ to family in Central America so they can get into US.
Repeat as you find additional freebies to steal/claim/create.