Could be true. Imagine if Pfizer had announced the results a week earlier and it had the Comey effect. I'd expect a few riots at that point. There's no way Pfizer ignored the political implications of the timing of their analysis and release.
Has it actually been proven that Comey effect was a real thing? I can't imagine the states Clinton lost was due to some folks not turning up or switching to Trump because of a latter by FBI chief.