Article mentions it uses hall effect thumbsticks. Does anyone know a reachable manufacturer for those?

I’m considering eventually producing hardware using them as a small-ish scale commercial endeavor, but so far the most i’ve been able to find are distributors on alibaba reselling them for $1 each as solder-in replacements for playstation/xbox/switch pro controller thumbstick modules, without information on their patent status - and that looks a tad strange considering gulitech seems to have patents in china covering them and doesn’t sell those specific modules despite using a marginally-similar-looking version in their own controllers (only making available joycon thumbstick replacements at a significantly higher price). As of now, without further assurance, these would be too risky to use.