Just a note: there is NO separate language for an AirBnB suite.
I am allowed to rent out the bedroom of my house, as long as they comply with IFC2018. That’s the only legal language.
I also cannot rent out a DADU, because I am not zoned to have a DADU.
I also can not rent out an Accessory Apartment (ADU I believe) because those can only be used by family. Those also require a permit to build. Those also require access to the house. I do not meet the requirements for that.
Unfortunately, as someone else found out, this forum cannot answer all questions.
Sorry, it sounds like you know the answer
The decision will be up to the city,,,,
But there should be an appeal process