I think you will find that IR comes under the 'stealth' heading too
I quoted o'bryan and said that I think he meant RCS when he said stealth
"We’ve taken it to a different level," O’Bryan said. The stealth of the production F-35—verified in radar cross section tests performed on classified western test ranges—is better than that of any aircraft other than the F-22.
sweetman link quoted
Hostage makes another, very interesting comparison between the F-22 and the F-35.
The F-35′s cross section is much smaller than the F-22′s. “The F-35 doesn’t have the altitude, doesn’t have the speed [of the F-22], but it can beat the F-22 in stealth.”