No, what I'm addressing is the idea that in a Ukraine war scenario the US could only stays in artillery fight for 10 days. Clearly all major military powers had lots of artillery ammo stocks, and unlike Russia, the US doesn't really rely on artillery but air launched munitions. So they might have to worry if they're going to run out of cruise missile and smart bombs instead ?USA and others stock for themselves. Not for Ukraine.
Unless China steps in to help Russia, the USA really need not to worry much about getting outstocked by Russia. Especially now it seems that Russia had starved itself of munitions in Ukraine.