I think we can conclude that Chez Simo Bistro has closed for good. I tried to call their main number and it's no longer in service. I tried the other number and get an automated text that says "please text me", but there are no responses to the texts. I also sent an email and that's gone unanswered.
I'm in Naperville, so it's not convenient to swing by to see what the place looks like. If anyone is close and can check, that would be great.