when I turn up the flame on my propane bbq, I start to get a hissing sound, like the pressure is too high. This started happening after cleaning around the burner. It happens on both sides so it’s not the knobs. Is it possible the regulator is busted? I’ve taken it off the tank and put back on but same result. Here is a video of the problem: https://share.icloud.com/photos/0RYk9cj1pOW11b082YBLHTqPg
If the gas flow is too high to maintain a flame, and it seems like the pressure is too high, then yes your regulator is bad.
I didn't watch your link since I'm on mobile, but some amount of hissing is normal if it seems like it's running normally.