Came up in their Generative Search so probably just a bug but it even had code for implementation which made me think there was some beta. Thanks though. Searched Google again just now and it says this now:
"However, Supertokens is actively working on adding MPC support to their platform. They have a roadmap item for this feature, and they have been working with MPC experts to develop a secure and scalable implementation.
Once MPC support is added to Supertokens, it will be possible to use it to build privacy-sensitive applications that are more secure and compliant with regulations. For example, it could be used to build a voting system that protects the privacy of voters, or a financial transaction system that prevents fraud."