Paddle shifters on cvt

CVTs are fragile units in Nissans and have been for a long time. I would say that what you are doing is going to cause it to lose a lot of life because of the internal design of those CVTs. In normal use the internal chain moves evenly across the sheaves and the load is constant. Using the paddles in the way you are essentially unlocks the sheave on either the drive or driven end to allow the chain to drop to a different place on the sheaves rapidly. It gives the sensation of shifting gears but causes a lot more internal wear because of the shock loading on the system.

I’ve got a 2023 Nissan Altima sr 2.5 L
With a muffler and resonator, delete the pipe, still goes all the way to the back of the car the resonator was just replaced with a straight pipe, and I often use paddle shifters almost daily because it makes the exhaust pop I was just wondering if there’s any long-term damage that I could cause my engine or transmission by using paddle shifters every single day I downshift at 2500 RPM and up shifted 3000 RPM if it will cause damage should I be worried about the 4000 miles that I have been driving like that for?

Can I use my paddle shifters every single day for the whole life of vehicle without damage if I’m not aggressive in downshift at 2500 RPM in upshift at 3000 RPM will me doing that prevent the car from reaching 200,000 miles

Short answer: yes, you can use the Altima’s paddle shifters every day, for the life of the car, without hurting it. It won’t keep you from reaching 200k miles, especially with the gentle RPMs you’re describing.