I know they were asked about that scene and reiterated that they'd definitely seen it in an early cut, but not that they actually went to (presumably) Fox and got official confirmation about it, at the time. Seems like the kind of thing the people at the other end would have corrected or said something like, "What scene?" If it was never filmed.
Strongest possible indication, to date, of its existence.
Was clearly at a point after it was decided not to include the cocoon sequence, though.