jointly operated bus routes not operated by KMB ...
The unfortunate is actaully the mindset of whoever drafted this document.
From grammarical structure to word choose, this document is an examplar of Hong Kong style English.
Taken by the words of 50 Anglophones, that sentence simply makes no sense in that context.
Anyway, 'KMB has the final discretion over the interpretation of these Terms and Condition.'