I know from my pretty Chinese coed girlfriends that Meiguo means America, so the rest of your Pinyin quote makes sense.
The question is whether the PLA leadership is aware of it.
Heck, the ChiComs sold us a quadrillion SKS carbines, AK-47 variants, Tokarev & Makarov pistols and Hawk 870 shotguns, and they would dare even wonder about a rifle behind every American blade of grass when half of those are of Chinese make?
Oh, and don’t forget thousands of Chinese broomhandle Mauser pistols with their neat holster stocks winding up on these shores.
Yamamoto asked the uncomfortable question without having to worry about Japan providing the weapons that would slay them like grass before the scythe had they chosen to invade.