You are correct we don't know how many parts or whole systems may have been removed, for all we know it may be a completely gutted air frame but even at that there is still a significant amount of weight remaining. Here is the source of the clip, he says there were gusts of up to 100 MPH.
https://www.youtube.com/watch?v=cHhZwvdRR5c
Read the comments section the old girl just wants to fly 1 last time

