Don't falsely quote, it's a disservice. The settings page never says "when this is turned off". It says what's happening in incredibly plain language and provides a link to the other settings which could confuse a user really attempting to fully disable the whole Bluetooth stack including OS level access. As others have stated, wanting to disable the ability of pairing is sometimes wanted while still allowing something like high precision location through Bluetooth scanning or other forms of 2.4GHz radio sampling. It's not entirely unreasonable for such a feature to exist, so to me it's not an unreasonable settings structure. Had they hidden the setting which could be conflicting with the user's request to disable all Bluetooth I would understand your point, but it's pretty clear what's happening when looking at the settings page.

Misquoting and falsely assuming things of others does a great disservice to your argument.