because its a new revision of the HE1000, that in most stores has replaced the stock of the He1000v2. And most people are used to using SE (stealth edition) and Stealth already interchangeably for the Arya stealth revision, so as soon as we start using them to differentiate with another headphone it becomes extremely confusing. There was no literally named Hifiman Sundara 2020 revision, but that's what everybody describes it as because it is clear and understandable. The HE1000V2 Stealth or He1000 stealth is the 3rd version of the HE1000, it replaces the previous stock just like the Hekv2 did the original. Thus it can be described as a HEKv3, because that is what it is, although maybe not what it is named. And as a name is much less confusing than having a HE1000 Stealth Edition and a HE1000 stealth.