They won’t and supposedly can’t turn over information from or about the account

Sort of, but not entirely. They use E2EE for message contents, so they would not be technically able to hand over that data (assuming their E2EE system is not compromised). However, they do NOT use E2EE for email headers, which includes email subject lines, recipients, and other metadata.

From https://proton.me/support/does-protonmail-encrypt-email-subjects:

subject lines in Proton Mail are not end-to-end encrypted, which means if served with a valid Swiss court order, we do have the ability to turn over the subjects of your messages.

From https://proton.me/support/proton-mail-encryption-explained:

Subject lines and recipient/sender email addresses are encrypted but not end-to-end encrypted