The author, as decorated as he may be, seemingly fails to appreciate the latter: in his own words, he has a “very low opinion of this self-serving nonsense”. The exercise of fleshing out the argument against the higher-order value of mathematics, you will note, is left as an exercise to the reader.
This is by definition an anti-intellectualist position: defending such a position, which goes contrary to what should be the default position in general, should require a very high burden of proof, not an offhand dismissal.