I do not share this position but I understand it may be someones legitimate opinion in general. I do not understand it here - when we are talking about a report like that.

Is it better to go unreported if the alternative is that an LLM was used in the articles creation?

Most people don't have time to read every article posted to Hacker News. Avoiding the AI slop in favor of human-written articles that promise a higher return on investment seems like a reasonable strategy. For that to work, AI slop must be accurately labeled as such.