Good grief what a stupid proposed law.
No, it's not.
I'm familiar with this area of Metro Detroit and have been following this story. The businesses in question are Korean, and their marquis are written in Korean script. It's an older neighborhood and dominated by a lot of strip malls.
Finding a numerical address in a strip mall is a challenge when the writing is in Engish, but when a foreign script is used it's even trickier. This is a question of safety not only for the business owner in question, but for any adjacent, English-speaking businesses. Just because I won't visit a store that isn't interested in communicating with me doesn't mean I'll exclude their neighbor.