This topic really is a testament to people's willingness to opine on things they have absolutely no clue about.

A first year undergraduate can completely check this counterexample in ten minutes. The original post even linked Wolfram alpha for the calculations.

And if you genuinely try you can very quickly understand using only high school math and a bit of Wikipedia that this counterexample is vanishingly unlikely to be wrong, even if you don't do the calculations yourself.