Do you have a link to that announcement? I don’t recall seeing it.
Would they did announce about a year ago was that they would provide “Matter bridge“ support for several of their hub models, and they have come through with that. In that structure, you can connect the Aqara devices to one of their own hubs, and then you can bring that hub into your smartthings account as a “matter bridge“ and it will bring many of the devices along with it. No custom code required. It doesn’t bring all models are all features, but it is a quick and easy way to integrate a number of a car models with smartthings now. 
However, you do have to have a smartthings/Aeotec hub to make that work.
Here’s a recent discussion thread from people who are using that method:
Matter Hub + Bridge + Aqara (Sept 2023)
Alternatively if you buy just the zigbee end Devices (not the Wi-Fi versions), you can also connect many of those directly to a smartthings/Aeotec hub, and that’s been a popular choice for several years. With that option, you don’t need to have the Aqara hub, but it can be somewhat fiddly, and some people find that the devices don’t stay online consistently. Those issues are solved by using the matter bridge method.
So, as always, the first rule of Home automation applies: “the model number matters.“ But there are definitely more choices now than there were a year ago.