Nope. Not at all. If the data were staggeringly bad, they'd have PR'd it on a Friday afternoon and followed up a few weeks later with another PR informing the shareholders on the new corporate strategy and how the $150mm in cash will be used.
They clearly saw enough positive data to submit to CTAD, and CTAD saw enough value in the data to award a coveted late-breaking oral presentations slot (something AVXL has not had in years despite a continued presence at CTAD).