The obvious is missed.
First, a mistake in the article. The production B1B is NOT supersonic. At supersonic speeds it's terrain following radar system (to keep it low to the ground) had some spectacular failures. Plus, the stresses on the crew from violent gain/loss in altitude was dangerous. The B1A-supersonic-was not part of SAC's inventory.
Second, Scaled does all sorts of composite (hey, it's in the name!) research projects-from pocket fighters, to airframe experiments for the V22, to transport aircraft experiments. Scaled came up with much of the advanced fabrication techniques used in the B2, even while they weren't involved in much of the actual aircraft design or production. They built the tools which built the B2-which is IMHO vastly more valuable.
Third, and I don't know why it's necessary to point this out again and again to supposed former military personnel and the blinkered peaceniks who post here- An ICBM or missile *CANNOT BE RECALLED* once it is fired. A manned bomber can be scrambled, and even flown into enemy territory, depending on that nation's alert status. A bomber can be in flight while negotiations between parties are still on the table, it is the "stick" when all talk of peaceful "carrots" have failed. A stealth bomber means you can keep more "sticks" in play while your opponent tries to eliminate them, and may keep the conflict from going to all out war because the bombers can be ordered to standby to bring your enemy back to the table, loitering, instead of committing to all out nuclear armageddon at the moment of button press.
Fourth-and this is very important-it puts HUMAN eyes AT THE SCENE. A missile is targetted based on policy and intel that may be faulty. A robot bomber may have the loitering deterrent effect but it can be fooled easier than a human crew and cannot make decisions on it's own based on experience. Even more importantly, to me, is that a human bomber crew has the option to DISOBEY if their eyes and ears show that the policymakers,intel, or even leadership is WRONG. A missile or a robot will never do that. A human crew might not, but there's that extra chance that the crew might notice that the country schoolhouse marked with the big red "X" is not the massive aboveground chemical plant, and a human crew can choose to hold back on the button for a second to allow civilians time to cross a critical bridge.
You can't cry about removing humans from the loop in case (killbot agitprop in Iraq) and then complain about expensive steath aircraft necessary for the survival of a human crew in the next.
To paraphrase: "UCAVs are fun but stealth bombers make policy"