Can exploiters change Bool Values in a local script?

So for example

a local script

local BoolDebounce = false

the reason I'm asking this question is because I'm trying to make a debounce for a gun I tried to do it in the server earlier but it didn't work out so im trying to figure out how to do it in the server

And I was wondering if I made a bool value in local script

they can just just spam change it to false

As long as you have FilteringEnabled, they won't be able to do anything to the server as it is local.