Not read it completely but sin bins are used in the non league pyramid (up to step 5), so the ninth tier of English football. They are there to punish dissent by word or action.
Having watched loads of football at this level, the inconsistency of application is outstanding. I’m not sure that anybody knows what dissent is a yellow and what is a sin bin? I’m not sure the refs do. I’ve even seen refs sin bin the wrong player, but they don’t care about that. The rules around a sin binned player are really complicated so will just cause more confusion.
It will be a recipe for disaster, not in theory, because it is good, but in application. Just another way for the big 6 to get an advantage over the other 14.