Respectfully, this is a stronger claim than I think anyone can make.

A more reasonable claim would be: "we cannot verify much of what's in Exodus using sources external to the Torah/Pentateuch." It's fair to also say something like "if X happened, it's surprising that we would not see physical evidence of it."

If you're interested in the topic of the Old Testament in general, I highly recommend [Ancient Near Eastern Thought and the Old Testament](https://bakerpublishinggroup.com/products/9781540960214_anci...).

It starts with a survey of the academic field, an overview of relevant primary documents from surrounding cultures, and in-depth discussions of historical records and archaeological finds. There's meta-discussion about the role of comparative literature that I also found useful. I benefited from the author's perspective that there's a lot to learn from the Old Testament regardless of whether or not existing physical evidence satisfies our personal standard for determining whether something happened verbatim.

I like that it does so in a way that does not try to push an agenda. I interpret the author as trying to provide an entrypoint for anyone interested in the related academic fields, regardless of their background.

I've recommended the book to both religious and non-religious friends who enjoyed it. Take this recommendation as one made in good faith, and an opportunity to look at something from a new perspective. You're free to disregard it as you see fit.