> So small character pool means that "probably" the password is short/weak.
I really don't know how you came to that conclusion. I never claimed any dependence between the character pool length and password length. They're obviously completely separate properties.
Right?
That percentage comes entirely from the character pool.
So character pool -> percentage -> probably short enough to brute force.
What am I reading wrong? The only assumption I made is "compared to a password with length n", because what else would you be comparing length "n-1" to. Otherwise it's a direct quote.