There is risk of disease and parasitic infection when eating any wild fish or game. The risk represented by this snail, when properly cooked, ought not be any higher than that represented by eating any other wild animal.
And you make this pronouncement based on the observed numbers of rat lungworm eggs and their frequency in the snails vs the number of parasite eggs in say a grouper or a tuna? The number of infections recorded in areas where the snails and parasites are endemic vs the number of parasites contracted through game and fish? Where did you get your information? Were you aware that snails are an essential part of the schistosomiasis trematode's life cycle?
Like I said before anyone here is welcome to my share of these disease ridden things.
What do they taste like? Like chronic disabling lung disease. An acquaintance contracted a bird mycobacterium in her lung. Will need three years of antibiotic treatment to get rid of it. As I previously stated the risk reward calculation in my fellow posters' brains seems to have been disables.