Nice find! The video is very well done.
If anyone knows the presenter, three small things:
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The term he’s looking for to describe the area in which motion will be detected is “detection zone.“ So there’s “field of view,” which he uses correctly throughout the video, and “detection zone.“ Not “range,” which he clearly knows is not the accurate term, he just doesn’t know what to substitute for it. Security companies will say “when something enters the detection zone,“ and put out documentation marking the lines of the detection zone.
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PIR sensors, which all of these are, should be placed at a distance from heat sources or you will get additional false positives. He’s got one that’s on a light and another one that is on the stove itself. Both of those are likely to get false positives.
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for PIR motion sensors, it’s helpful to know that motion (really, change in heat) is detected as it passes across the lens, not moving towards the lens. So some of his sensors are going to take longer to detect than they would if they were just moved 90° to the current placement. See the FAQ:
FAQ: Where to locate motion sensor for fastest response?
Again, those are small points, and don’t detract from the excellent level of detail in the video. 