A face-down monster flipped into face-up Attack Position by a card effect such as "Book of Taiyou" or "Ancient Forest" is not considered a Flip Summon. Flip Summon does not take up your Normal Summon/Set for the turn.
You cannot Flip Summon a monster at the same turn it was Summoned, Normal Set, declared an attack (even if the attack was negated or canceled), or its battle position was changed manually that turn.