Flipping a monster into face-up Attack Position with “Book of Taiyou” is NOT a Flip Summon.
When a Flip Effect Monster is flipped face-up by the effect of “Book of Taiyou”, its Flip Effect is activated. You can Set a monster and use “Book of Taiyou” on it that same turn; its Flip Effect will activate.
Netrep Rulings:
If “Book of Taiyou” flips a Toon monster face-up, that Toon monster may attack that turn.