I had over 50000 miles on my 2014 and with around 6-7mm left on the pads i went ahead and had the brakes relined and rotors turned anyway. It felt a lot better to stop after, also did the brake fluid flush a month or 2 later...that made a a huge difference with compression softness on the pedal. What I'm getting at is, with only 20k miles on the car, you should have a lot more meat on the pads. I'd check that myself, and then if it's BS, call the dealership and straighten them out. I have no quam calling out a lair when it comes to defrauding me out of money.
Also, trans fluid flush is at 50-60k if I recall. they also recommend a drain and fill, not an actual flush. Being that this car has a 100k powertrain coverage, just get it done within interval. I had mine done around 45k if i recall, again, i like to get things done early . but with under 20k on the clock, that dealership is recommending work that is likely unnecessary. I'd call them out on that too.