Did you request a CLI, or did the bank just grant it out of the blue. If you requested it it is valid as you did request additional credit, but you should have been informed that it would happen. If it was an online request there would have been a box to check to approve this.

If you did not request the CLI, are you sure it is really a hard pull? How are you checking? I have had a couple things pop up in notifications on Credit Karma or Sesame, but then they are gone when I look at the actual report. I think they either get confused about a soft pull and report it as hard, or refresh something old.