Thats a bit problematic. Yeah, the website still says because it holds "lightning info" which actually is a lie. The wallet operates with a two of two multisig so there is this pdf that has the backup data... but like, you want a wallet for your main stack that you can access if a company goes out of business. Anyway the backup data contains multisig wallet Metadata. The Website says that when you make a payment, you sign and Muun signs, which makes me worry that if Muun's servers are down, you can't pay... haven't heard of this happening though.