Absolutely. Absorbtive materials only work to the extent that there's some sort of restriction a half-wavelength out from whatever the sound waves are reflecting off of - and this foam is really thin. On the other hand, it's cheap, easy to apply to already-built shrouds and will probably do at least something - just not a whole lot.
I've done it with a couple of shrouds. I'm not sure the noise level went down (I think it did but it was small enough a difference that I could easily be imagining it), but the MBM readings stayed the same, so it didn't seem to hurt temps, or at least not enough to get noticed by MBM.
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