At the time there was no science around the efficacy of "scarfs" and coronavirus. Plus, can you see how that would play out? Oh, you don't need N95 masks, scarfs should just work out fine. You think that wouldn't still trigger panic/hoarding?
Hoarding was already happening regardless:
The stockpile, slated for medical personnel in New York and New Jersey, includes 192,000 N95 respirators, 130,000 surgical masks and nearly 600,000 medical-grade gloves, the authorities said.
www.nytimes.com
Fauci's primary concern was HCWs.