For 99.999% of mixer users, these commissions are not available, since such transactions are rare.
But there is still a possibility to get a discount on the basic 0.4%, so this information is correct.
Maybe LeGaulois can add some kind of footnote for such cases. Just enough for users to be informed that it is necessary to fulfil certain criteria for the lowest fee.
This reminds me of the ads on TV that show prices and then find out that in order to get that value, the buyer has to meet a lot of conditions.
I totally agree with you on this, I'm not a fan of "up to" offers.