I would say, don't fall into the trap of inventing rules where rules don't exist or seeking clarification where no clarification is required.
The self declaration is just that - self declaration. It doesn't involve a medical person. You either believe that you meet the criteria specified in the declaration document, or you don't.
There are whole bunch of pilots out there who have failed/lost their medicals, with disqualifying conditions, who now benefit from the self-declaration process. The CAA know this and that's why they introduced it. It's very clear, if you don't tick all the boxes, and there aren't many if you only want to fly small aircraft, you must obtain an LAPL medical.
Get on with it! Make an appointment for counter service, get the UK PPL (A) and you could be flying again by next week.