Nobody is an expert on every subject. You could have PhD level knowledge of the theory behind a specific filesystem or allocator but know next to nothing about the underlying hardware.
However, in this particular case, I agree that it is not a valid argument since it is doubtful whether the beginning kernel contributor's patches are in good faith.
[1] Torvalds encouraging new contributors to send in trivial patches back in 2004: https://lkml.org/lkml/2004/12/20/255
It's like "be kind I'm new to the concept of airplanes, let me fly this airplane with hundreds of passengers"