Again: the maintainer does not say there is no bug. He says: please open a new issue, with a proper title and description for the actual underlying problem. Is that seriously too much to ask? Instead, the guy writes a whole blog post shitting on the project. Does anyone still wonder why people burn out on maintaining FOSS projects?
Not great behavior I agree, but what else is there to say other than "it does not match the spec at point 1.2.3"?