It's marginal gains all the way here but genuinely if you're an omnivore the E-Bike might work out more enviromentally conscious
I am a machine that converts beans into food related emissions.
You could argue that the increased energy burn from cycling is offset by not needing exercise elsewhere. Cos like people gotta exercise but if your transport is exercising then two birds one stone right? If you use an ebike and go to gym after that isn’t saving on my fart related emissions