I think the flags have more been because of the poor sourcing of the actual death. It seems various people and groups heard that he died and are posting their obituaries and remembrances, but there's no real factual confirmation or details (e.g. one thing that was briefly on the front page here [1] was a link to an unsourced, now-deleted tweet from Momentum UK).
[1] https://news.ycombinator.com/item?id=40721271