There is, indeed, no hardwired instinct for nutrition (which Soylent provides) but there is a hardwired instinct for eating tasty food (which Soylent doesn't provide).
How does the parallel with blow-up dolls go? There is no hardwired instinct for reproduction (which blow-up dolls don't provide), but there is a hardwired instinct for having orgasms (which blow-up dolls do provide, or at least may help some people with).
Seems almost exactly opposite to me.
there is a hardwired instinct for eating tasty food
There is a strong hardwired instinct for eating food, tasty or not. As I said, the criteria is that it stops you being hungry and makes you feel satiated. Soylent satisfies this instinct.
Whether Soylent provides adequate nutrition remains to be seen.
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