The idea that Tao has accomplished more than, say, Serre because the latter, who won the Fields medal at 27, only received his PhD at 25 and his bachelor's at 22 while the former received his PhD at 21 and his bachelor's at 16 is so absurd that it can be refuted merely by alluding to it.
This is clever application of existing ideas, not the sort of new idea which is needed. No one can really imagine what sort of machinery will need to be built to prove the RH. A proof is completely outside the realm of speculation at this point.
See my sibling comment - where does the insistence that octopus is third declension come from? The reality is that while most Greek loanwords are third declension, many are not, and Latin authors tended to not be consistent.
No. You seem very confident, but octopi is (grammatically) perfectly acceptable. The English word octopus is taken from the Latin (coined by Linnaeus) word octopus, which is of Greek origin. Greek loanwords in Latin were used very inconsistently, but many people on the internet seem to believe that it MUST be a third declension noun. However, Pliny treats the structurally identical polypus as second declension and uses the plural polypi (see https://www.perseus.tufts.edu/hopper/text?doc=Plin.+Nat.+9&f...).
Your other points are similar.