People wandering in the desert for 40 years, or even 1 year, leave traces. Especially when it's thousands of people (at a minimum).

The Hebrew language came long after the exodus. We have no earlier records of it that aren't written in Hebrew.

So what we have is writings written hundreds of years later documenting an event with no earlier writings verifying that documentation.

It's possible that a small group of slaves escaped egypt and that was the actual origin of the exodus story which just kept growing and growing with retellings.