Beg to differ.
The article references burying the packed guns. If you do so, they had better be in a sealed container and, for belt and suspenders safety, be packed with desiccant.
Also, it you follow your prescription on a nice humid summer day, seal the gun in plastic, and it is stored in a location where the temperature drops significantly at some point, you will rust the crap out of your gun. If it’s not packed with desiccant to absorb the excess moisture.
It is not difficult to find desiccant materials in bulk and in a huge variety of packaged sizes online. Quite cheap, if you go to general packing materials sites not specialized gun stores.
It’s all about perspective and assumptions.
I live in Colorado, where humidity is not a concern.
Also, I’d pack in newspaper, or similar, not plastic.
AND burying in the ground is not a consideration either.
Besides, if “they” are coming after them, THAT is when it’s time to use them!
Not hide them!
Craft stores sell it in gallon cans. Silica gel I believe.