Here are two articles now based on police and LAS releases that state the victim was a pedestrian, which is at odds with the report from jj72's friend, to him and on Reddit.
This is clearly the crash at the junction of the A3 West Hill and Lytton Grove, and there doesn't seem to have been another. Either he really wasn't on a bike or the Human Forest bike that she reports he was riding wasn't associated with him by responders at the scene. We can't know either way, so the ambiguity persists, albeit no longer in official reports. It's tragic whatever the case may be.
Here are two articles now based on police and LAS releases that state the victim was a pedestrian, which is at odds with the report from jj72's friend, to him and on Reddit.
https://www.yourlocalguardian.co.uk/news/24697323.lytton-grove-putney-man-20s-dies-crash-lorry/
https://www.mylondon.news/news/south-london-news/young-man-dies-after-being-30287199
This is clearly the crash at the junction of the A3 West Hill and Lytton Grove, and there doesn't seem to have been another. Either he really wasn't on a bike or the Human Forest bike that she reports he was riding wasn't associated with him by responders at the scene. We can't know either way, so the ambiguity persists, albeit no longer in official reports. It's tragic whatever the case may be.