The article presumes
that the extra knowledge
that would enable us to prove the R.H.
also would enable us to factor composite numbers.
Not unreasonable, but not established.
I don't even think it's that reasonable. The RH (and GRH and ERH) are analytical or statistical statements, and lead to conclusions like "there must be a prime in this interval", or "there must be a quadratic non residue in that interval mod N", and so on and so forth.
I'd love to see a really fast factoring algorithm, but I just don't see how proving the RH or any of its variants is likely to lead to it.