Yes, those peaks are on China Lake property. That's why Maturango Peak (along with Argus Peak) was suspended from the DPS List. But it appears plenty of people are poaching them. I'm not advocating that, however. 
Too bad we can't use this much shorter route to climb Maturango Peak from the road south of Darwin: 1946 trip report
Too bad we can't use this much shorter route to climb Maturango Peak from the road south of Darwin: 1946 trip report