Without going into too many "inconvenient bodily issues" regarding flushing I will describe why I trust them:
I would normally agree, however Cottonelle specifically weaves their product to be flushable (with a binder that dissolves on contact with water) and immediately begins breaking down. The also weave them with short (very short) fiber length. I have actually tested this. I - on the advice of a plumber friend - filled a mop bucket w/1 gallon of water, added a wipe, stirred with the mop handle for 20 seconds (to simulate a flush). The wipes began to loosen up and break down...into many small pieces. I then poured that into the toilet and they broke down further with just that amount of water movement.
I trust Cottonelle. They explain here https://www.cottonelle.com/flushability why their product is safe to flush and - as you did - compare against paper towels, kleenex and other "hygeine products."
Also, the one thing they don't mention but is true: You use less of a moist absorbent cloth to clean than you do a dry few sheets of toilet paper. This means less paper/fabric/fiber to do the same job...thus less chance of a blockage in your pipes.
Been using them for a decade. Never a problem.