This is what one school of thought says. Another school of thought says that people still buy deflating computers, mobile phones and other electronics, and Intel would have gone bankrupt long time ago if "mattress theory of deflation" is valid.
Another school of thought also says that inflation is a second form (after the taxes) of government oppression over the citizens; and that truely free currency should avoid both forms of government oppression: inflation and taxation.
He's talking about economy wide price level deflation, not some particular group of products. Inflation is a necessary element of capitalism, since productivity growth would have a deflationary outcome if prices staid flat.
Another school of thought also says that inflation is a second form (after the taxes) of government oppression over the citizens; and that truely free currency should avoid both forms of government oppression: inflation and taxation.