You are wrong about that. The US Copyright Office is very clear on this issue, long before the ruling involving Thaler:
Works That Lack Human Authorship
As discussed in Section 306, the Copyright Act protects “original works of authorship.”
17 U.S.C. § 102(a) (emphasis added). To qualify as a work of “authorship” a work must
be created by a human being.
It very clearly means that any images & content generated by AI, even with human input, cannot be copyrighted, as it is not created by a “human being”.
This is especially obvious as programs like Midjourney or Dall-E generate a different image each time for the same text prompt.
It also does not matter what Midjourney states in their terms, because national law overrules any individually made terms.