And 44 people could have saved themselves injury with their seatbelts LOOSELY fastened, why don't they listen?
How do you know this ? They migh all have had their belts on and the injuries coming from falling luggage, overheadbins doors falling, galley trolleys , etc..
If you read previous injuries reports from severe CAT you can see that seats belts alone is not a guarantee to escape injury. But the advice is correct: keep them on at all times if you can.