Cuprajake Whoever said that is quoting the number it can/could be set to, rather than the actual output it can achieve. In reality, most machines top out at 8ml/s and a few go a little over (depending on AC mains voltage), but nothing known out there hits 12. Decent were recently considering lowering the max value that can be set, because it is misleading.
A recent post from Colin (works for Decent Support) confirms this:
I also went and read the Discord - here is the last reply to you from Rohan:
