The reason I am asking is because at the top near the driver it says not to obstruct or distract him. […]
Is this “distracting”?
This is a bit quite funny confusion.
No, it isn’t. A sign asking to not distract a bus driver means you should not try to discuss with a driver a recent football game nor discuss it loudly by phone with your friend while sitting near the driver and not to obstruct means avoid putting your snowboards in a way that reduces driver’s visibility.
A stop (bell) button is actually designed to avoid engaging a (possibly distracting) conversation with a bus driver just to say a bus should stop on the next bus stop.
Drivers expect that signal and it is less distracting than trying to ask a driver politely in a few words.
Also, remember to ring the stop button (or pull the cord) slightly before approaching the bus stop as the bus driver need some time to respond and slow down a bus safely, if you call the button when a bus is already passing a bus top it might be too late for a safe stop and a driver might skip it (not being happy about your late response.)
Probably a bus operating company should update that sign to be more clear and avoid such confusions by adding something likeL “press a stop button when approaching a bus stop you want to exit.”