The people with money can afford to wait. The stereotypical way of doing things (the way those supply/demand curves are based on) is maximizing profit at current demand levels by finding the highest price at which the truck will sell. Actually getting that profit by making a sale is essential. But under algorithms, the entire market can go into collusion mode and say, "Hey, we're going to target these profit levels and we're going to MAKE you like it, or we'll just wait you out." Maybe they'll get it now and maybe they'll get it 6 months from now, they're fine either way. But they know that they're not just driving up their profit on that one sale, their price collusion drives up the price on ALL their inventory and thus the reward is so much higher than just one sale.
Maybe they'll make an error sometimes and that one truck doesn't sell. But if they drive up the profit 50% on two other trucks that do sell, they've made their profits anyway and are still sitting on extra inventory on top of it. Failing to make one particular sale isn't the driving factor it once was before whole-market collusion could drive prices up across the board.