I'd wait before believing no crease. My Z Fold 8 had basically no crease for the first week, after it has a slight crease that hasn't seemed to get any worse in the 3 weeks since. It's only noticeable in dark room with dramatic down lighting at certain angles, or when display is off, but it IS there. There has been some talk of Samsung actually having a better anti-crease solution than they opted to include in the z fold 8. Apparently their display division and mobile division are pretty separate and mobile only gets what they are willing to "pay for". It's possible apple ponied up for the better tech where Samsung mobile did not this year. But I'd still want to wait until people have had the thing for a few weeks and put it through it's paces before I believe any "no crease" claims.
I would wait until there's a display model at an Apple Store, then give it a week while it goes through approximately a bajillion fold/unfold cycles, then see what the crease looks like.
Only people who have not used foldables worry about crease. I've used one for 5-6 years, and even with an older generation it has never been an issue. Half the time it's literally bent, so obviously there is a kink. At this point my screen has hairline fractures down the middle and even that doesn't actually bother me.