I'd take the link with a pinch of salt, I've never measured the teeth or spacing as I've never had need to.
As long as tooth count it correct and they are narrow enough to give a decent gap between them then logically there shouldn't be an issue. I've seen front teeth rusted away a fair bit and not caused a problem.
I had a pair of rear discs I took off a car once, don't know the make, can't remember why but I checked the bearing in them and noticed that where the and ring sat on the hub it had been machined off centre so the airbag between the ring and sensor would of varied but no issue on the car.
Only found this once but normally if I'm taking discs off they just get chucked in the scrap, never check anything on them. I should of really measured them to check run out and tried to find the make of them.
Also curious as to why no mention of the sizing and spacing of the 'faulty discs and Renault ones??