I've seen it argued both ways. The text before the chart is what sways me. "....that serve as the main power feeder to a dwelling unit ..." but more importantly "For application of this section, the main power feeder shall be the feeder(s) between the main disconnect and the .... branch cirucit panelboard(s).
If you were to work it out, that the garage panel originated at the main disconnect, then I think it is ok. But if it is a subpanel to the main panelboard, then use 310.16.