Earlier quoted context omitted.
Ehh... Cough, tough, bough, lough, slough, and rough called, they wanted to know when English phonology became logical and consistent, and why no one informed them about it?
Rough and cough have different sounds so... buses is the winner? Not seeing the connection.
-ough notoriously has anywhere between four and twelve different pronunciations (if you count strange example with a limited number of words, like hiccough for hiccup).
The point I believe the parent post is making is that you cannot assume that buses would rhyme with fuses, because English orthography is so inconsistent.
Which is partially true - I haven’t seen any research to the effect, but I’d guess you can still predict the pronunciation of an English word with better than a fifty percent chance of success.