Think he might be thinking that it means the minimum teeth is 99 yet it goes down to 80 on the chart.
But if you look oliv, the total minimum 'combination' of spur+pinion is 99 total, 83 spur + 16 pinion = 99total.
And max combination is 80 spur + 28 pinion = 108 total.
I know it has 80 spur and 16 pinion on the chart, but I'm assuming that this combination can't be used.
So therefor it all looks correct to me.
