How does irrelevant information supplement the point? It's only a distraction.

Your interpretation of their post seems quite generous. They made a single statement, and didn't back it up with anything like what you are saying they did.

So it really is a whataboutism: "Whataboutism is a rhetorical tactic that attempts to deflect criticism or avoid addressing a point by responding with a counter-accusation or question about someone else or something else, often unrelated to the original issue".

"Weapons manufacturing" has nothing to do with "website creation". It is a whataboutism.