Actually, we've been over this ground already. I took it up with AA. I believe the explanation was, if, in the first 6 months, you develop any of the listed conditions, you won't be covered, but whether this is for an indefinite period I've no idea. If, however, you declare a pre-existing, then the insurers will decide on the level of cover, if any.
The red breaking news "quote", was taken out of its context. I believe it was put up by a broker elsewhere in Thailand as clickbait, if you like. It was poor practice.