It was almost certainly closed captioning. Those aren’t quality checked in any way. They’re auto-generated buy a voice recognition program. Subtitles are usually quality control checked. But even those not so much anymore. I used to work in post production for DVDs and streaming and we would do quality control checks on subtitles but it really depended on the client and how much they were willing to spend on having someone actually watch them. I’m guessing here - not so much