This has been claimed over and over and is possibly true in some test scenarios but not in any real situation. Noise is additive, the engine noise may not be clearly audible, but tire+engine noise is always louder than just tire noise. And any time an ICE actually revs up, it's clearly audible at any high speed.
I drove (passenger) in a friends electric car once. That car is significantly more quiet than a lot of cars I've been in. Some other people mention that noise dampening takes care of the noise, but that just proves above: an (ICE) engine is very noisy!
It's also very apparent in some hiking trips: any ICE is terribly noisy. You can easily determine which cars are electric though. Everyone driving electric would hugely cut down on road noise. I cannot wait until everyone can afford and uses one.
Excluding cars that are purposely build/modified to be annoyingly loud.