No, you would not clean injectors by pouring a product down the throttle body, but you can by adding to fuel, or the tap in port that the dealer uses to cleanse the injector lines (available service - and what kind of product do you think they use?)

Of course a new motor may need absolutely zero fuel system maintenance - but do you know where the fuel filter is and how many hours involved to remove teh fuel tank ffrom teh car to change it? Got to be the absolute dumbest thing the car manufacturers have ever done, eliminating a replacable fuel filter from the vehicle. Despite what the oil companies would have you believe, today's gas is dirty, dirtier than what we bought 20 years ago when we could change out a filter. The other documented problem with certain vehicles (Chrysler is notorious) is a buildup in teh fuel lines of a black substance that, like plaque in your arteries, will restrict flow - its not carbon from combustion, but black plastic, shedding from inside the fuel tank.

Oh, and BTW, some people her have alternate rides and since this forum contains the most and best info on car ownership anywhere, well....

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When more than one friend wants to ride shotgun

No, I do not work for GM or any subsidiary or supplier.