Actually, it is. Moore's law implies a continuous decline in the prices of computers.

Deflation is a persistent rise

Decline.

in the general price level as measured using a representative basket of goods

The defined goods area can be broad or specific, and in any direction. There has been consistent deflation, for the past several decades, in the area of computer products. Individuals and groups (companies, etc.) that tend to value computer products highly also tend to delay their purchases of those computer products in anticipation of price declines, i.e. deflationary action.