You probably have drive by wire and can't actuate the plate manually is why you're asking.
I haven't tried cleaning a DBW tb yet so I'm going to offer a suggestion. Get a helper to set in the car with the key in the run position engine OFF and have helper actuate the gas pedal and see if it will move so you can spray and wipe with shop solve or similar carb cleaning solution.
I do this operation on my 2000 Silverado a couple of times a year when it starts to feel sticky when easing off of idle.
At about 85k miles, it threw a "check smog system" light. Took it to the dealer and they basically said it needed TB cleaning. Doorknobs at dealership said to have it done every 15k miles which I doubted. I have 97k now and every time it hesitates a bit, i get to thinking.