I think this rule is confusing and unclear, it needs to be amended. Part a of the rule interpretation says a toe drag is OK facing the field of play, but then says out of bounds if heel touches out, but the positioning of the player doesn’t change in part a or b. So if he dragged the toe backwards while going out of bounds and the heel never touched it is a fair catch??? The position of the player (facing the field of play) doesn’t change between part a and b, only a drag versus toe-heel. What does that mean, in the rule explanation, they don’t change the position of the player but the result is different.
BUT... and here is my main problem, it clearly says toe in the singular form, and he had BOTH toes down in bounds. I suggest with both toes down, the toe-heel rule while falling backwards out of bounds did not apply. Should not have been over-ruled in my opinion.