What he is saying is that races arent won on the first lap, or the first hour, but they can definitly be lost that way. if its a 2 hour race, ride a good pace for the first 1 1/2 hours, that way you have energy left at the end. bikes become more spread out towards the end of the race so passing becomes easier. The guy that says its a race, Im riding 110% from the green flag is going to be tired, he will slow down, he may be sore because he crashed, he may have jacked his back hitting something to hard, well he is going to hand the victory to you not because your faster, but because your smarter. Its called strategy.
After you do a few of those races, you will find yourself a much better rider too.
How do I know this works??
The 1st year I raced I followed the philosophy that if blue is up and brown is down, you can go faster. That led to a broken knee and a broken neck. There is definitly truth in the saying that if you slow down you will go faster. you will crash less, break less stuff and collect more trophies riding smooth and fast than you will pinned wide open wide eyed and terrified.