I can imagine scenarios where a full refund would be make sense, but refund isn’t really appropriate when we’re talking about small changes in schedule, especially when everyone agreed such changes were possible.
But frankly, if the only thing you took out of this post is that the ISA structure is poor, without considering how you have all the power to set and enforce terms in your contract, I don't think I have much else I can say to try and help you. I think there are a lot of ways you can improve Lambda School to make it better for the people attending. And they don't involve deleting Reddit threads of criticism.
Edit: s/selling/securitizing