It happened, but then it’s up to each manufacturer to decide what they want to do about it. So far SmartThings hasn’t done anything that we know of.
As mentioned in the post above yours, there is now a list in the community – created wiki of devices that work with both SmartThings and HomeKit. Hopefully there will be more in the future now that the chip requirement has been removed. Devices sold commercially still have to go through a certification process, though. More details in the following thread: