How to test the validity of a Coding Style rule

Is it possible to refute the statement by citing the code in runtime, which is probably fine from Microsoft’s point of view? I think it’s acceptable, I don’t know other criteria. I have a feeling that reading recommendations is useless, just as in a language you need to listen to live speech, read books, and not short topics. For example, there is a statement: it is desirable that there is only one exit return statement from a function. Such statements are involuntarily remembered because they are categorical and simple.
Maybe I’m wrong, so just in case, I typed keywords into Google function only one return statement The number of references is enough to confirm that such a statement exists.

Probably, it would be possible to compile a list of statements of this kind and then refute them, prove that in general they mean nothing.

Look at the code HashHelpers.cs.

  public static bool IsPrime(int candidate) 
    { 
        if ((candidate & 1) != 0) 
        { 
            int limit = (int)Math.Sqrt(candidate); 
            for (int divisor = 3; divisor <= limit; divisor += 2) 
            { 
                if ((candidate % divisor) == 0) 
                    return false; 
            } 
            return true; 
        } 
        return candidate == 2; 
    } 

An alternative approach could probably be like this:

    public static bool IsPrime(int candidate) 
    { 
        bool result = true;
        if ((candidate & 1) != 0) 
        { 
            int limit = (int)Math.Sqrt(candidate); 
            for (int divisor = 3; divisor <= limit; divisor += 2) 
            { 
                if ((candidate % divisor) == 0) 
                    result=false; 
                    break;
            } 
        }
        else{ 
          result = candidate == 2; 
        }
        return result;
    }