That's a bit like saying the manager of Celtic is worth a punt.
How?
Comparing the qualities of the Dutch league to the Scottish league is a non-starter. In Holland you have PSV, Twente - teams that have the quality and budget to win the title. You've also got a few other good quality teams - Vitesse, AZ, Heerenven, Groningen, and Feyenoord. In Scotland, it really is a one horse race. You've got Celtic, no Rangers and then the rest are teams that are round about Championship to lower championship quality. Inverness, Dundee United, Hibs etc.
By the way did you know before De Boer was appointed in 2010, Ajax hadn't won the title in 6 years?