Vague remarks about the design of the plane being unsound at any point in time prior to it being approved to fly passengers, doesn’t reveal any information at all about the soundness of the design of the plane that was eventually approved to fly passengers.
The source and year of the quote I took from the guardian article I referenced.
I’ve got no idea what you mean by ‘long before’, unless you somehow Switched what I was talking about - my point is exactly that the employees were discussing that they wouldn’t fly on it the year following the start of service. QED?