I'm pretty certain Satoshi's identity is known, although not publicly stated and/or confirmed by anyone. I believe a handful of the early developers had very strong suspicion as to who was behind the name, but never pursued a confirmation of it.

My money is on Len [1]. The sheer number of coincidences, crossing of rare skill sets and interests, time, place, penchant of pseudo anonymously publishing things and happened to take his own life <2 months after Satoshi's final gloom-filled message, "I’ve moved on to other things and probably won’t be around in the future".

[1] https://evanhatch.medium.com/len-sassaman-and-satoshi-e483c8...