I'm sorry, @woomba, but the last sentence discredits the author in the same vain the expert witnesses discredited themselves.
Late apexing purpose is to gather a deeper view in to the corner and to make the turn-in quicker. This means the bike is leaned over for less time. This is still a "single lean angle turn". Even though the author doesnt explicity state it, Fifty-pencing (or mid-corner lean angle corrections) is the inverse of a "single lean angle turn". It means the rider chose a bad line and it will require one or more course corrections throughout the turn.
There are other articles where he explains his reasoning about late apexing a corner in more detail. To elaborate, yes, if you plan to late apex a corner, you can't take said corner at the same speed as you would by taking a racing line. In order to do a late apex, you must be more conservative with your speed before turning in.
The advantage to late apexing is you get a better look at the turn, especially for unfamiliar turns (Blind turns in particular). Many accidents happen when a rider takes what they "think" is the racing line at a speed close to the limit. Then they discover they apexed too EARLY, run wide on exit, slam into the guardrail, and bad things ensue. Late apexing the unfamiliar turn would have saved them.
As for familiar turns, I have no problem taking the ideal racing line.