i think he is saying you have 6 outs to make on the turn without the flush and that the flush will make 1/3 of the time in total. But this is wrong because if you hit on the turn, and your opponent is still drawing, then he is about 20%. 20% of 6 is 1.2, so if we subtract 1.2 from 6 its closer to 4.8 outs, not 4. So think of it as about 5 outs as compared to 4 or 6.

Do i have this right?