To me, that reads as passive aggressive. "It's unfortunate you didn't do your job..."
I think it's a better approach to say "The problems are X. We know this because of Y. My proposed solutions are Z. If you agree, let's get together and figure out how to do Z. If you don't agree, let's get together and figure out where our analyses diverge and how we can come together."
I think it's a better approach to say "The problems are X. We know this because of Y. My proposed solutions are Z. If you agree, let's get together and figure out how to do Z. If you don't agree, let's get together and figure out where our analyses diverge and how we can come together."