Earlier quoted context omitted.
It's not an assumption, the commenter also clearly stated, "I hope that's constructive". To some of us, it sounds belittling and dismissive, regardless of how well he knows his company better than us.
There is a big difference between "I don't believe you were trying to be constructive", (which make assumptions about intent) and "I found your critique to be un-constructive, here's why:" The former adds nothing to the conversation and is pretty close to being a personal attack, the latter provides feedback and (may) prompt constructive debate about how to provide critique.
Just a list of things that are "wrong," according to the poster.