I found videos detailing what people believe the RWS whistles sounded like

I don't really know anything about the RWS or how it fits into the TTTE universe.

The whistles sound more realistic, almost chilling in some ways in most of these videos. Why is this? Is the RWS darker than the television series?

https://youtu.be/x-351PcEGGo?si=WHxu7N9ywb8FOESl

https://youtu.be/8sxs5jmDXMM?si=ubHIl4oId7jEW29S

Sorry if I sound dumb.