I wonder if this Air Force general has seen any of the wargames about how the USAF performs in the opening days of, say, an invasion of Taiwan. A significant fraction of air assets are destroyed on the ground and the rest of the air assets have trouble getting into theater.
To be fair, that's partially why the USAF General thinks it's dumb; if China can take out facilities in Guam, then what's stopping them from also taking out the Army's land-based systems? At least with the USAF you can fly B-52s, etc from Hawaii or Alaska (or CONUS with extra refuelling) and launch your hypersonics from those. When tensions get high you can also just have B-52s constantly rotating in the air, armed with ARRWs in case an attack is launched; if intelligence can't provide targeting before the facilities in Guam, etc are destroyed, then that's unfortunate but at least some of the B-52s are still airborne and can launch when the targeting is ready; the aircrew can then either land somewhere else in the region or ditch near allied territory. The Navy is in a similar position to the USAF.
Now on the other hand, the Army could position its launchers in discrete and changing locations in South Korea or Japan, etc where saturation attacks aren't as feasible, but generally the US doesn't use run & gun tactics with its SAMs, etc and it looks to me like their plan for LRHW isn't any different:
I'm not sure about about South Korea, but in Japan that would not be possible. Even the few US Army facilities there are on the mainland are controversial and I highly doubt the public would accept more US bases, let alone TELs driving around all over the place.
Even new JSDF bases are controversial, Aegis Ashore was killed partially because the local government where it was supposed to go felt it turned them into a target (the other aspect was money related).
I'm not sure there could be such a thing as a discrete location. Pretty much every military base in Japan is available on Google Earth (that is, placemarked or whatever it is called), it would be fairly obvious where they are. And when the TELs try to scoot after shooting, surely the TELs barreling down the Japanese highways with police escorts will trend on social media, and their position will be revealed to the Chinese intelligence network. Japan is too mountainous and doesn't really have backroads where the launchers could transit unseen.
Formerly known as Project2035, TyeeBanzai, and FlyForLenin