I spent a few days in a hotel

Yes, maybe try adding a disclaimer kind of thing at the beginning of your videos. You know, that big black warning screen with red or yellow font color "Do not attempt at home or when alone... follow the rules... this video was recorded with the consent of the persons involved..." I'm no lawyer so check the wording before creating a proper disclaimer.

I don't know the exact rules of PH so maybe a disclaimer is overkill, as a first test try waving at the camera or creating a hand gesture instantly recognizable to the viewers, or start recording camera in-hand to show you are placing it on the 'hidden' spot.

PS. I love your outfits! Looking forward to watching more of your videos.

I would go with starting your camera when walking to your room with gear in hand.
Place everything on the bed or floor, set up your camera, wave hi and point it on the area where you are going to play.
I also think adding a clock to the video would help as well.

Then do your bondage video.

That way, the screeners will know what you’re doing.

It's definitely something to keep in mind for future videos. I'm not sure if they have some automated process that flags videos or if it's all human but it sounds very human that once the video gets flagged it's hard to clear it as the connotation is there. So indeed some obvious footage of me setting up the camera and turning it off at the end, holding a paper with a statement... I'll make sure to have this going forward.