Very nicely done. Great editing. And the music is well chosen and appropriate. It's good to hear music in a drone video that doesn't sound like the tense and dramatic soundtrack for the onset of World War III.
Strange that in all the years I've been hearing this sort of nonsense, I can't find any recorded flight data to support it.
But I've found plenty that indicates the "plausible explanations" that you've listed above.
You'll be fine.
All my flying is done over the ocean and I've flown thousands of miles.
What you're planning has no more risk than flying in an open playing field.