Maybe I'm missing it, but nothing in that article says FWWM was booed because it was "boring" or "didn't answer any questions."
FWWM is excellent. Deeply flawed, but excellent. It was the follow-up nobody wanted or expected
at the time. I think history has proven how important FWWM is to the complete story of Twin Peaks, and it (mostly) gets better with age.
But in 1992? At Cannes? Damn right people booed it. It was Lynch's "fuck you" to their very expectations. He made the story he wanted to make, and suffered the consequences. If he made a 2-hour Dale Cooper solving mysteries kind of movie, they'd have given him a standing ovation. And THAT would have been boring as shit.
FWWM is more than that, but okay.