There is no evidence to demonstrate that the Egyptians generally did this. Certainly, we don't know enough to prove his speculative assertion that Egyptian records are silent about Moses because all references to him were expunged. Someone as allegedly spectacular as Moses could not have disappeared without a trace, so Hutchinson must explain why a God who places such extreme emphasis on faith would have allowed all independent confirmation of Moses to be expunged, thus making faith more problematic. It seems like a cruel trick. Hutchinson, as further excuse, also brought up the Red Sea story, which would provide material for an entire article.
Legends do seem to magnify over time, and here it erroneously became the Red Sea.
Meanwhile, note that yam suph lay directly between their home in Goshen and the Sinai, an indication that the Red Sea was not the proper body of water. Other problems with this story are the decimation of the Egyptian army, which would not have occurred had the firstborn sons actually been killed in the final plague. I leave these problems for Hutchinson to chew on, but I am confident that he will refuse to acknowledge any difficulty. This fact would establish beyond dispute that Washington had not only preexisted the Civil War era but had been important enough to have the national capital named after him. Compare that to Moses, who wasn't mentioned in Judges or the books of Samuel and Kings commensurate with his stature as God's emissary, so there is no evidence that such a person had had any palpable influence on Israel at that time in its history.