Oh God, What an imbecile we have here. Mutation rates are reported as substitutions per nucleotide site per cell infection (s/n/c), The more virus spreads, The more it's likely to mutate. Polio has only human host, That's why it can be vaccinated and the less it spreads, The less it mutates, But still it can cause problems.
COVID-19 on the other hand is a zoonotic virus, It spreads among humans and animals which gives it more chance to mutate. From the same article that pushed you to come up with bio-weapon bs.
I don't know what i'm talking about, Says the "biologist" who came to the conclusion that COVID-19 is a bio-wepon because of its mutations.