Yes, you are right. But only the 11 I mentionned had an experience penalty. These are the ones that should (could?) have a little something special treatment?And St. Cuthbert, Istus, Iuz, Nerull, Ralishaz, Ulaa, and Xan Yae.
Only Boccob, Fharlanghn, Raxivort, and Zagyg of the ones with a description had none. So 18 out of 22 had special stuff for their specific clerics.