Witnesses aren’t required, in Michigan, for a holographic will. The will must be dated, largely in the decedent’s hand writing and clearly reveal that it was i tended as a will.
Lol, you’re right, I looked up holographic wills here:
https://www.annarborprobate.com/estate-planning/2022/12/02/is-a-holographic-will-valid-in-michigan/
I was mistaken to use this website, that says wills must have two witnesses and doesn’t mention holographic wills.
https://michiganlegalhelp.org/resources/wills-and-life-planning/making-will