Here is an excerpt from the comment section of the video we are talking about.
Knowing that some negative comments have been deleted, I am surprised that Jonathan D. has let this one through.

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Joseph Lorenz

7 hours ago
How the heck do you safely maintain visual separation from powered aircraft flying in and around clouds like that?? If you're not careful, I fear you'll be prematurely joining your friends who now fly in spirit, or worse, causing it for someone else...
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Vicarious Icarus (Jonathan D.)

7 hours ago
There are never any powered aircraft in any of the locations flown in this video except when it is clear and cloud free. Why? Because I'm in the mountains and without combat aircraft terrain following radar autopilot they'd all strike either the mountains or high tension wires. It's a fair a reasonable question and merits a factual answer.