You said that I have to use code, I underlined it in your quote. You have to means that I must do, I'm forced to use that code and all I said is that I'm not forced and it absolutely depends on me whether I use that code or not.
There is an option to not use the mixing code, simply leave the field empty.
But when you proceed to the next step on 'Your Mixing Order' as I mentioned here: https://bitcointalksearch.org/topic/m.62675758
The mixing code is automatically filled, and you can't delete it.
Please try to prove it.