A small observation;
Genesis 18:19 says
"For I have chosen him, so that he may command his children and his household after him to keep the way of the LORD by doing righteousness and justice, so that the LORD may bring upon Abraham what He has spoken about him."
This was the way for which they would have been destroyed in not keeping while in Egypt before even coming out.
6 In the day that I lifted up mine hand unto them, to bring them forth of the land of Egypt into a land that I had espied for them, flowing with milk and honey, which is the glory of all lands:
7 Then said I unto them, Cast ye away every man the abominations of his eyes, and defile not yourselves with the idols of Egypt: I am the LORD your God.
8 But they rebelled against me, and would not hearken unto me: they did not every man cast away the abominations of their eyes, neither did they forsake the idols of Egypt: then I said, I will pour out my fury upon them, to accomplish my anger against them in the midst of the land of Egypt.
9 But I wrought for my name's sake, that it should not be polluted before the heathen, among whom they were, in whose sight I made myself known unto them, in bringing them forth out of the land of Egypt.
So Israel had a 'way of the LORD' back then all the while in Egypt that they had to go by, plus a few more a little after that e.g in Exod 13:3 about the first borns, the unleaven bread, the Sabbath and general details about their feast days
5 And when the Lord brings you into the land of the Canaanites, the Hittites, the Amorites, the Hivites, and the Jebusites, which he swore to your fathers to give you, a land flowing with milk and honey, you shall keep this service in this month.
6 Seven days you shall eat unleavened bread, and on the seventh day there shall be a feast to the Lord.
7 Unleavened bread shall be eaten for seven days; no leavened bread shall be seen with you, and no leaven shall be seen with you in all your territory.
This is what Moses apparently 'overstates' as the laws and the statutes unaware that the biggest part was yet on the way.