In reply to Leopoldo Portugal.

Hi Leopoldo, yes you could do the evaluation over longer lags. This would be appropriate when there is longer supply lead time, so you evaluate the forecast you made at the lead time.
In the blog example, I compared the latest forecast to the naive "no change" model based on prior week's actuals.
If, for example, there is a 3-week supply lead time, then you would compare the 3-week ahead forecast to the naive forecast (which is the actual from 3 weeks prior).