After I answered you privately, I thought of something else. Since the heater is brand new, you still have the owner’s manual. Somewhere in it, it will show the anode location. So will the spec sheet for that model online at GE’s site.
But if it is not in that opening, the possibilities become more troublesome. It’s not impossible, although unlikely, that GE has started selling heaters with a combo rod instead of hex anode. Or worse, that they’ve started hiding the hex anode under the sheet metal.
Nobody has done it that way for years. American-brand heaters used to, but they stopped sometime in the late 1990s. But at any moment, things can change.
But I expect that if you rummage around in that opening, you’ll find a hex anode.