That's correct.

Also White Noise uses the new internet standard Message Layer Security (MLS) which is well audited and has security proofs, while SimpleX has their own encryption scheme. In theory White Noise should scale to encrypted groups with millions of participants, we still have a lot of work to do to make this possible.

The main difference is, that White Noise builds ontop of the Nostr MLS protocol, and so it should be compatible with a lot of other nostr clients that will support secure messages, like nostr:nprofile1qqs9xtvrphl7p8qnua0gk9zusft33lqjkqqr7cwkr6g8wusu0lle8jcpp3mhxue69uhkyunz9e5k7qg4waehxw309ajkgetw9ehx7um5wghxcctwvsqs6amnwvaz7tmwdaejumr0ds2g5zx8