The Sellers Research Group (that’s me) is highly dubious of this report: Twitter account holder @analyst941 claims that Apple plans for an Apple Watch to be able to sync across multiple iOS/iPadOS/Mac devices, and will no longer be tied to one single iPhone.
As MacRumors notes, currently, an Apple Watch can be paired to one iPhone only, and though it is possible to pair multiple Apple Watch models to the same iPhone, Apple offers no facility for pairing or syncing Apple Watches to other devices in its ecosystem. Personally, I don’t think the tech giant has plans to change this anytime soon.