Commercial airports (including a surrounding of 2-5km plus additional clearances for approach) are do not fly zones, private helipads and airports operate under a general proviso that you use caution and don't fly near the approach, pad or runway during operating hours and that you land immediately if you see an aircraft/helicopter in the sky. While you can fly 30m above private property, 99% of the time under a recreational license you can't fly over people, crowds, large stadiums, events etc. or fly in a way that is un-safe or dangerous to those around the drone.
With all of that in mind - given the amount of helicopter traffic in the broadwater and around the spit when he would've flown his drone combined with the flight paths he took it's definitely dodgy.
TLDR; don't go out and buy a second hand DJI drone, fly it recklessly around a park and ruin it for everyone so you can get a hundred views on YouTube.