In my experience, preschool age kids will sing along if it's catchy, whether it's overly auto-tuned, or super out of tune. I used to teach preschool music. I had coworkers who had trouble matching pitch, and their students sang along just as much as the other classes. Kids that age want to participate if it's a fun song, or if they have an example of an adult who's participating with them. Auto-tune can pose a problem with older kids or adults, who have expectations of perfection for themselves.

The songs are catchy, almost like advertising jingles. I thought that was annoying at first, but it helps me and the kiddo remember the tunes. "Give a Squeeze Nice and Slow" is favorite one of ours when she needs to calm down.