abnomilies should be looked at by anyone if they are invested in a stock.
One could equally well say that for biotech any investor should understand how to read clinical data PRs - i.e. it shouldn't have been a surprise to you that unconfirmed partial responses don't count when comparing to historical data.
However, having said that I will acknowledge that the reality is that short term traders (interested in market psychology) probably don't care too much about clinical data. But by the same token long term investors don't care too much about whether some particular fund is selling or not - the funds get it wrong as much as they get it right.