Advance grading

I religiously, (without purchasing) watch that coin show that airs on TV. What puzzles me is the mint will release the Walking Liberty Half Dollar 2016 Centennial Gold Coin on November 17, 2017. The official mintage will be 70,000 with a household order limit of 3. I realize that these large companies cosign multiple people to order coins for them which accounts for them having so many coins immediately upon the release.

My problem is how can this dealer air on November 13 that they will have 178 First Day of Issue (FDOI) coins in 70 Grade before the coins are released to the public. Many dealers pre offer graded coins before they receive them I understand that.

Question -- How does this dealer know in advance that they will have 178 coins in 70 grade? What does this say about grading if you can guarantee a grade before the coin is released.

I know NGC and PCGS will label coins First Day of Issue based on the date received but I don't think either one of them will guarantee how many will be 70 grade.

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