My Canadian is less fluent than it used to be, but another article from CBC sheds a bit more light I think. Here's the link:
https://www.cbc.ca/news/canada/nova...great-white-shark-near-hubbards-n-s-1.7620548
The quote from that article that got my attention:
A relative novice with less than 50 dives under his belt, he was on a guided dive in waters near Fox Point Beach, about a 40-minute drive from Halifax, N.S., with Torpedo Rays instructor Eric Peterson when they encountered the shark.
So I interpret the instructor/guide's reference to the "second" dive not as OW2 but the second dive after a surface interval. And the comment at the end about "while teaching" is possibly because he does a lot of teaching dives at the site.
Video credits in the clips are to other names - neither the instructor/guide or the person that it seems he was guiding are listed so the footage probably comes from other divers in the group