Those are two absolutely different things. One stems from production, transportation, and financial improvements across the board, the other comes because fewer people want to buy anything.
> The traditional theories that warn against deflation are concerned about consumers delaying spending in the hope of waiting for even cheaper prices. This delay theoretically forces the economy to grind to a halt.
It's not so much about consumers delaying spending. It's what happens further up the chain. If the holders of wealth that seed the economy figure out that it's better for them to hold on to their assets rather than invest them, then people lose jobs. We need them to keep investing their money.
Deflation also penalizes debt holders. The dollars you spend to pay back your mortgage are worth more than the dollars you make now. Since most Americans hold more debt than assets, deflation hurts common people more than it helps.