That's not correct.

"Standard Mode (Default): By default, LAN mode will include an authorization process that ensures robust security. This option is ideal for the majority of users who prioritize security and ease of use. Despite claims to the contrary, LAN mode through Bambu Connect will require neither internet access nor a user account. This hasn't changed and won't change." With the firmware that implemented security in, third party only speaks through Bambu Connect. Reading the page I included that information and if you go to the original security update announcement, it is clear you can only use Bambu Connect for third party access. In addition you lose the ability to control the printer.