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There isn't really much difference in terms.
"Feature" is from the days when a theater might show a cartoon, a newsreel, and a short or two, before the main or "featured" film being exhibited. Although theaters mostly dropped the other content a long time ago, "feature" stuck as the term for a long-form work on film.
"Commercial" denotes a project intended to turn a profit in the commercial marketplace - as opposed to a limited-interest or short piece which is not intended or expected to compete in that market.
Today the two mean more or less the same thing - a work whose length and content are chosen with the intent of releasing it into the mainstream market.
I think that by "commercial film" he means industrials, training films, intra-corporate and inter-corporate type production, as differentiated from the "show business" (theatrical/tv) kind of work prevalent in the Los Angeles production environment.
I'm not sure how impressive being "located directly underneath the famous Hollywood sign" ought to be. There are also plenty of homeless people and hookers "directly underneath the famous Hollywood sign," but you don't see people using that as a promotional claim...