In step #4 there's a conversion of odds of 0.0041 to probability. Of course when so low probability and odds are almost the same. But there are typos in the calculation. It says:
4. Convert posterior odds back to posterior probability. P = Odds/(1 + Odds). So this is 0.41(1 + 0.0041) = 0.0041, or about 0.4%.