words - Is bentching with a minyan considered a davar shebikdusha?

Closely related (particular example of): What is the meaning of Davar Shebakedusha?

The Aruch Hashulchan notes that the wedding blessings require ten men, but are not a 'davar shebikdusha' (E.H. 62:11). What about bentching? If yes, why doesn't it make the Rambam's list of devarim shebikdusha (Hilchos Tefillah 8:4)? If not, why are ten men required to use Hashem's name?