That telephoto part seems to be a downgrade. Interesting.
On paper that's a downgrade compare to 15 ultra which have quad camera setup, so We need a good trade off for triple rear camera setup.
OV50M is ok for front cam but big no for ultrawide, JN5 is better than OV50M due to slightly bigger sensor size.
The optical zoom for the telephoto is worse (3x instead of 4.3x). There's up to so much that SW can help with zoom without turning into trash.