California has a requirement for a "cool roof". The color of the roofing is one indicator of a cool roof. The installation of a radiant barrier is one exception to the requirement. That applies to much of the state but not in my jurisdiction as we changed it up some. So the company that manufactures Low-E touts it as a radiant blocker.....not a radiant barrier.....ICC is quick to point out that Therma Sheet has not been tested or approved as a radiant barrier.
It looks like a radiant barrier what with the aluminum foil and all......but it's not. A legitimate radiant barrier requires a minimum one inch air gap. I see OSB with radiant barrier being installed over 1"x sheathing because the people doing it lack an understanding of how it works.
While the energy requirements are sorta important the bigger concern is the up to 7/16" layer of foam rubber under an asphalt shingle. Even if they go with one layer of Therma Sheet and one layer of felt, there's the lap splices.
It's one of those things that a right thinking person recognizes as foolish but there's nothing that can be done about it.