I'm not sure what the exact requirements are for noise, but I think it has to do with decibel levels over a particular distance rather than right next to it. Higher frequencies will tend to dissipate faster than lower frequencies. Plus, when you've got a smaller jet, the fan is going to spin much faster (physics and such) so it's going to make a high pitched whine.
I find that a recording usually doesn't do a good job of accurately mimicing how loud or quiet jets/engines are. I'd imagine up close this is still pretty loud, but still meets the noise requirements.