No.
What Ted is saying is that you're assuming they can sell all the ad inventory if they were to put the commercials back in those hours. There's no guarantee they can. Most stations I worked for assumed 70% of available ad inventory would be sold and budgeted accordingly. If you beat that, great. Then your revenue exceeded expectations.
As for placement of spot breaks, what Ted is saying is that you can't assume your competition will sit still. If you put your spot break so that you're in music when I'm in commercial, it's not a huge deal for me to move my spot break so that it ends just before you go into yours. Then I'm in music when you're in commercials.
We can chase each other all around the clock if we want to. Nothing says anyone has to stand still.
Advertisers have ZERO input into break placement, or even where their spots air in a given break. There might be someone out there still trying the old trick of charging more for a guaranteed first spot in a break, but not many.
Advertisers absolutely can and do have the ability to ask for their ads to run in certain dayparts and not others, but they pay different rates for different dayparts and if they want morning drive but it is sold out, they're gonna have to settle for a daypart with available inventory.