A good view of another GB member's watch was obtained some time ago. I recall posters here who had studied the images to compare to the real thing, confirmed then it was a real top-of-the-line Apple watch. GJ's images don't really show much other than color and thickness.
Mad I is correct that it isn't having expensive items that is necessarily wrong, but more the obsession and showy display. The conflict is, WT council is always to simplify, be modest and not put-on a showy display of ones means of life. That implies, even if a person can afford whatever they want, they are to be modest and discreet in their choices.
As Jesus did not have a place to lay his head, the GB members as 'Christ's Brothers' and the 'Faithful and Discreet Slave', should be setting an example in modesty. Even if it is a knock-off, it portrays the illusion of being expensive and is therefore, not simple, modest or discreet.