No. Uriel is right.
The only practical reason to use the paddle-shifters I have found is to lower the CVT gearing by one or two increments if you need some additional acceleration/ or you want to manually lower the gearing when going uphill under load to reduce strain on the drivetrain (this sort of works for about 4 seconds, then it reverts itself to the gear position as before).
There is a potential use for engine braking as well, but the need would be so infrequent on anything other than an incredibly steep and slow decent, because under normal driving it would be advisable to make use of long stretches of road for regen without using the brakes, and just using engine braking in the normal 'Drive' mode.
The only other use for the paddle shifters is to manually select 'manual' mode, and is it 'snow' mode, iv'e forgotten as I barely use it - when you want to gradually move off from stationary on a steep upward incline in say traffic when the car is full of people to reduce CVT strain. Unfortunately Honda made this less than intuitive, so I use it less than I would otherwise - but I suppose it could have a protectant effect.
On the plus side, they make for a nice looking addition.