Still counts. As long as you would have bought the vehicle for your own use anyway, it's a sunk cost. Whether or not it's profitable to rent it out via Lyft depends solely on the incremental costs of the extra driving -- not how much extra driving you do. And if it is profitable, then driving more is more profitable, not less.
But that's a likely direction.
And if you're trying to make much money from Lyft, you're probably driving it much more for Lyft than for yourself already.