[Xhad]

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If you're going to count the 2 theoretical flush cards that were folded, you have to count the 8 non-flush cards that were folded as well or you math is flawed.

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It's even worse than that because when you are suited in spades and flop a flush draw, the average number of spades in your opponents' hands will be lower than normal (Conceptual proof: any average distribution of spades should include the case where your opponents' are dealt 10 or 11 of the other spades, but if that happens flopping a flush draw is impossible; but there is no reason to similarly exclude any case when your opponents have less spades than normal. Therefore the average number of spades when you flop a spade draw must be below average)