It’s the older ones that don’t need a hub, because they connect cloud to cloud.
The newer ones that either have the matter logo, or that you updated the firmware on so that you could use matter, will require a smartthings/aeotec hub if you want to use the matter integration, because all matter integrations do at the time of this writing. But I believe you can still use them cloud to cloud with the original integration as well if you prefer.
FAQ: What do I need to add a Matter device to the SmartThings app? Do I need a bridge router device?