Yeah, most likely....especially if the wait time was short and the kid didnt have a problem with it.
I'd trust my 10 year old to sit by themselves for 10-15 mins and play on a phone and wait for us without wandering off.
Last December I took my twin 10 yr olds alone to universal. One son didn't want to do Harry potter so I left him by the butter beer cart with my cell phone to play on, and he was fine!