The statement you objected to was used to demonstrate that a specific claim by LastPass ("As a reminder, the master password is never known to LastPass and is not stored or maintained by LastPass") offers no guarantees that your master password is known only to you. This, in turn, leads to the conclusion that, even if you followed all of LastPass's guidance on master password security, the prudent thing would be to take some action - something that LastPass explicitly denied later in the statement.

I'm sorry if you find this disturbing, but I do not see why it should not be said.