The host was asking about Philippines in particular where discounts and VAT exemptions to Senior Citizens and Persons With Disability are mandatory for certain transactions including hospitality businesses when the Senior or PWD IDs are presented. Your business can be fined or licenses can be revoked. That being said, this isn't something you should worried about if your property isn't in The Philippines. Airbnb recognizes this and includes that notice in their help center but not the procedure of applying discounts.
In digital formats such as Airbnb and the food delivery counterparts, implementation is quite tricky though. Food Delivery apps (think UberEats) arent compliant yet because the year 1992 law obviously hasn't considered digital platforms. On the contrary, restaurants, airlines, and hotels with online orders/ bookings already provide discounts. I imagine Airbnb has yet to comply.
Legislation is moving towards covering digital platforms so Airbnb might be compelled to add such discounts conveniently upon ID uploading (this is currently pro-rated. i.e. if a group of 3 book a hotel room for 3 people and only one is qualified for a discount, only a third is considered in the discount and VAT exemption)