Bottom line is we don't know on what basis Anavex could conclude all endpoints met, yet not being to shown how then and even now 3 months after.
We don't know I what went wrong exactly if anything, we can only speculate and so is the market. It just leaves uncertainty as reflected in the $AVXL share price of a presumed 'met all endpoints' of a fumbled readout.
All we can to do is evaluate and react individually to our $AVXL investment. Then wait hopefully for reaffirmation of the cold hard data kind.