It's just derived from the human learning experience. One of the fundamental principles of learning math for example, "don't skip steps", Quality control: "Don't cut corners", etc. Is it absurd for people to think A must come before B?
Secondly, the American Ford class had so many issues with the EMALS, it was easy to think China would also run into many of the same issues. Naturally, if they did have many issues, then it would make sense not to delay the carrier and go with steam to get the project going.
From all the chatter, we do know that there was a parallel steam catapult development, so again, none of this thinking was too crazy.
They do have more experience, I don't think it can be discounted. The question is whether that experience is overrated or not. In any case, it is pretty irrelevant because it's unlikely Indian and Chinese Naval Aviation will ever need to contend with each other within our lifetime.