It had been in the works for a while, but now it has formally been adopted. From the article:
The regulation provides that by 2027 portable batteries incorporated into appliances should be removable and replaceable by the end-user, leaving sufficient time for operators to adapt the design of their products to this requirement.
The Galaxy S5 had waterproofing and a removable battery, and it worked alright. They’ll just have to make sure the gaskets and latches aren’t garbage.