I'm sure you are correct about presenting bad results. However... In this case there are several things mitigating against that theory.
First of all, most trials that present bad data are high profile trials from big companies. Anavex trial is neither. Remember that Anavex is a footnote in the pharma world at this point.
Secondly, Anavex could well present negative data and it seems unlikely that Anavex would do that in one of the highest profile conferences in the world.
Thirdly, It seems unlikely that the most prestigious AD conference would choose to present a failing PDD trial as that would have little relevance to the AD audience.
That footnote categorization is about to change methinks.