I guess you have read this...
https://www.airasia.com/my/en/baggag...equipment.page
They seem to have quite a well defined list of what is or is not sports luggage.
Sports equipment
The following sporting equipment can be checked in, subject to a
sports equipment fee, which can be either pre-booked at a discounted rate online or at a standard rate at the airport check-in counters. Remember, each checked in item must not weigh more than 32kg.
Any sports equipment that are not mentioned above will be accepted as part of your
checked baggage.
However, we do not accept carriage of the following sports equipment:
- Hang gliders
- Sails
- Kayaks, canoes and oars
- Pole vaults
- Javelins