There's research (and my own anecdotal evidence) supporting my initial claim, so I don't see how it's an obvious mistake. Do you have anything to back up your point?

This is like arguing with a wall. Right back from Gibson & Walk’s 1960 visual‑cliff experiment, there's endless research showing that babies don't have an innate fear of falling. It's so uncontroversial that it's now taken as undisputed fact in medical documentation and research.

You linked to an article about the visual-cliff experiment (apparently having not read it?) as it is what kicked off the avenue of research that came to this conclusion and which has been confirmed and uncontroversial since the mid-2010's.

It's also the lived experience of billions of parents.

There is no currently viable counter-arguments presented anywhere globally. There is more consensus about this issue than, for example, anthropogenic climate change or pangea or any number of other issues than reasonable people aren't expected to defend due to their overwhelming acceptance.