You do have good reason to be concerned. But what I see is not warping. The siding where you see gaps at the bottom edge are where the siding is no longer held in place at the bottom. The siding is to be nailed only at the top so the next course above covers the nails that hold it in place. The bottom is held in place by locking into the top of the lower piece. It can be surfaced nailed and needs to be under windows where windows need a rip cut to go under them properly. It looks like the siding has not been locked in well enough in many of the places you have marked with arrows. Back at the surface nailing, The places that are not in plane with the other siding courses can be nailed through the lower edge to bring it back in place, but it MUST be nailed into the studs. I would rather see it done right the first time by having the bottoms properly engaged with the top of the lower course, but that would require a LOT of siding being removed. But since face nailing is acceptable by the maker, it is workable, but criteria must be met. I looked up the install guide for the product, to learn about what I am passing onto you.
The gaps you pointed out are needed as part of the install, but need to be caulked. Since Canexel is a prefinished siding, Canexel has color matched caulk and touch up paint for their products.
All this should be done by a trusted pro and get estimates, if you choose to. Deduct that cost from the selling price. Or have it done ahead of time as part of the purchase agreement...And get a guarantee from the company that fixes it. If it is not done right, you will still be the one living with it.