They are right. Shows are adjusting to capture the little attention spans we have left from the excess use of technology. My 4 y/o loves old episodes of Sesame Street, but the new ones are just visually busy and boring on topics.
I’ve noticed this with many more shows recently and personally don’t subscribe to it. I very much dislike how more shows include distracting visuals, sophomoric humor, and sexual innuendo as if it’s normal for younger kids. It’s not. Rewatching what I watched as a kid at these ages(Barney, Sesame Street, Gullah Gullah island) with my kids definitely shines a light on that.