Yes, that's a good point. The document does specifically talk about avoiding contact with fallout, or removing it if necessary. Hopefully everybody gets inside before it drops.

Seriously, Covid is extremely low on my list of worries if I am close to a nuclear explosion. Like so far down that I can't see why it should be mentioned at all.

Radiation, access to food/water and breakdown of society are the only realistic concerns I can think of right away.

And I am not really sure if preparing is all that helpful, at least not the kind of preparation that is mentioned here. What I need is a way of providing food long term (years), and be able to defend it. In a place without radiation.

I strongly suspect they don’t update these documents every month to keep up to date with different waves. That wouldn’t even make sense for a nation-wide document like this. Most likely these docs just got updated once when COVID first became a big deal, and will be updated again whenever someone decides the pandemic has subsided enough that it doesn’t need to be in these docs.

Average flu deaths in the U.S. for the last decade are about 35,000 per year. In the U.S., even with vaccines and Omicron, we still had over 70,000 covid deaths in the last 30 days. Given that a typical flu season is 4 to 6 months long, I would say even the last month Covid has been much worse than a typical flu season. So, a covid outbreak in a fallout shelter would still be very difficult in that environment. There will be many older and otherwise immune-compromised people in a crowded shelter who are susceptible to a still highly contagious virus. It is completely reasonable to at least attempt to be cautious in the short term.

By the way, "everyone" is not vaccinated. Only 65% of Americans are fully immunized at this point. I'm not saying Covid is the threat it was a year ago, but some prudence is still reasonable.