Just changed my belt and tensioner also. Belt was easier but the tensioner required a lot of patience to maneuver it. Belt for the water pump was fine for me so I didn't change it
Take it to a different dealership and don't mention anything in particular. Pay the $150 diagnostic fee and have them inspect it. Take the findings to your original dealership and have they fix it and reimburse you (if they did screw up)
My 2016 mounts have started to crack and the movement seems to be the same like yours. However, no weird sound. It's hard to diagnose when you're driving vs stationary.
If it's leaking coolant, you'll likely see white residue after it's evaporated. You said theres smoke. Put the car in park, pop the hood again, and have someone rev the engine. See if that would generate more smoke.