A reminder that at that time there were no vaccines available, and the US was seeing a fairly large increase in both cases and deaths.
So someone was tasked with adding COVID precautions to this document then, and they have not been removed.
The idea that disease is a non-issue during a disaster (nuclear or otherwise) seems rather myopic. After a disaster, resources will be scarce, people may have to fend for themselves for a while or travel because they've been displaced. Why you wouldn't take reasonable and simple precautions to not throw disease on top of that is beyond me.
It also mentions not using disinfectant wipes on your skin, which is likely because it can cause irritation. Skin irritation also seems like an "absolute non-issue" and yet you aren't taking umbrage with that.