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This is incorrect.

Similar to the "we can't make concrete as good as the romans" line of woo. Caveat Emptor

I like how you topped off the Roman non sequitur with some Latin. Alas, it is correct. Here[1] is an article about "Fogbank."

We don't need to make exact replicas of every single old material. "Won't have an effective arsenal within a century" is silly.

And that absolutely was not a non-sequitur.

Thermonuclear weapons have considerably tighter engineering requirements than sidewalks. So much so that the comparison is ludicrous.

Even if you think the comparison is very bad, it's not a non-sequitur.

"If Roman cement misconceptions exist then the US hasn't forgotten how to make Fogbank" is literally a non sequitur.