@Anne11619 This is a most relevant question for Airbnb to address as some boxes to be ticked (or not) can easily be misinterpreted by those not certain as to what certain terminology means (or so I think!)
Personally I believe that if anyone doesn't know what "on the premises" actually means, the box should NOT be ticked until the Host has had explained to her/him that entering incorrect information on their listing will not only gain the ire of Guests, but also possibly lead to requests for reimbursements (partial or full).
Here in the UK, there is also the matter of the Trade Descriptions Act, and that listing a product incorrectly (and "Holiday Accommodation" is not an exception to the Act) could lead to a prosecution (at worst).
All of us are (hopefully) responsible for how we "sell" our places, from the "only s stone's throw from..." comment, to what we say we "do" have.
If uncertain about certain elements of a listing, it's far better for the Host to not "say" something is being provided/is available, and for Guests' to query the situation, than for Hosts' to provide false information.
For all any of us know, the Guest(s) booked to stay might have a disability* that walking any distance - should parking "on the premises" not be available. Surely all Hosts' have a moral duty to ensure that only factual information is proved to Guests? (Re *, my wife has debilitating rheumatoid arthritis, and having had all the bones in her hands already disintegrate, and now her ankles are giving her great pain and problems, whilst she can walk a fair way if necessary, for her not having to would be a deal-breaker should we want to stay anywhere).
Not being provided with what we've been promised, might - like @Anne11619 make us question the legitimacy of the listing, but for others, those Guests may well take stronger action!
Excellent comments as well by @Helen3 @Helen744 and @Richard531