I guess that depends in part on what the critic is intending to convey. Describing writing as "lazy" is not uncommon.To me, “lazy” is a personal comment about somebody’s work ethic. It’s not a critique of the material.
Eg often when listening to a pop song, one can anticipate a rhyme. That is lazy composition. The use of cliches, or of stereotypes, can be described as lazy writing. Etc.
These aren't judgments that the author didn't try hard - some people try really hard but can't come up with anything but cliches and obvious rhymes. They are judgments about the ingenuity and quality of the work against some notional standard of what can be expected in new works.
I've got no idea what the other threads were, and what was being judged as "lazy design" in those threads. But the notion itself is pretty common in criticism.