Trudeau admits they are developing covid strains.
The words came out wrong, and he quickly corrected himself. 'That are being developed' was corrected to 'that are emerging'. Like any political leader around the world, he is interviewed a lot, and sometimes the words just come out wrong. In this particular instance, I'd imagine, again as with any leader at the moment, that he is constantly fielding questions around vaccines, and is constantly referring to
vaccines 'that are being developed'.
What's more likely:
A) A simple statement that came out wrong and was quickly corrected, most likely thinking of vaccines 'that are being developed', or
B) He accidentally revealed the sinister truth of a huge conspiracy that involves Canada and perhaps other nations deliberately cooking up a virus and spreading it in order to destroy their own economy and kill their own people.
I'd go with 'A'.
People misspeak all the time. I had a friend who accidentally hurt someone in a football match. They were lying on the ground hurt, and he ran over to them and said 'Are you sorry?'. He didn't mean that he'd hurt them on purpose, he actually got confused between saying 'I'm sorry' and 'Are you okay?'
These things happen.