EFF don’t say they know who you are, rather how unique your device appears. This is a problem because if you appear very unique, only if one site knows your identity, everyone can potentially know it.
When you generate a report they tell you which bits of your device were unique. For an iPhone running the latest iOS there is nothing in that list that leaks a significant number of bits.
My point is they don’t claim any of the bits are unique (all of the individual things are very common) and still someone end up at an answer that is “unique”.
