Oh? Hmm.. What about auto-hinting? Some of the smaller fonts get a little wonky when it's on. You might try doubling the font size and then shrinking it down.
Ah hah... I just opened the file and I see what the problem is. The PNG files are in indexed mode; you should switch to RGB mode. (Indexed mode pretty much undoes any benefit that anti-aliasing might provide.)
I did my best to ignore this series at the time, so that I could read it completely edited when the time would have come. It seems that the wait payed off, so thanks team Platina + Red_wing!