I don't quite agree with this indifference approach.
You can't reasonably expect men to remove emotion from any interaction with women. Abundance on the other hand is something any man can do rather quickly. It means accepting yourself and knowing your life will go on just fine without that specific woman. Honestly, there are so many women coming in and out of your city that you'll never run out of meeting attractive women. shyt, even in my city, there are at least 400K women in my dating pool.
So, if you understand that basic fact it's totally cool if one woman flakes, you've got something else going on with 5 other women. It's especially helpful in the beginning when you're learning game because there's a filter in your head that prevents you from saying what's on your mind, but if you know it doesn't matter because you're not going to run out of first impressions then you can plough through as many approaches as you need to get comfortable with game.