Lyft is investigating all methods to get to Level 5, ruling out or requiring a specific tech doesn’t make sense at this stage.
Source for LIDAR based?
There's a big spinning LIDAR on the 'engineers' page
Everybody who isn’t crazy is still looking towards LIDAR, at least in some fashion, to get to level 5. I’m not saying it’s required, just that anyone taking safety seriously hasn’t ruled out possibly needing it.