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Then let's not speculate. I can only find one news report so far, with a couple of timed updates that seem to be based on mere hearsay (and I won't quote them here):
https://www.mylondon.news/news/south-london-news/upper-norwood-live-updates-after-19263531
It always takes a while for information to become firmed up, so let's be patient.
There is even still confusion about where exactly it happened--the police statement says Knight's Hill, not Crown Lane. Whether it was right at the junction or some distance away hasn't been reliably reported yet.
Edit: I just saw that the police statement has been updated since it was quoted in the article above.
Don't want to speculate, but if they were turning right off Knights to take Crown Lane in direction of Streatham Common then the area where traffic waits to turn left/right across the junction is quite sketchy, especially for cyclists.
Edit: Added a screengrab from Google Maps. Lots of traffic. The driving around West Norwood and the surrounding areas can be... 'below-average' at the best of times.