They need to be either live lectures online or pre recorded material designed for online audiences
At the risk of continuing to sound pissed off and defensive, I can assure you this is how all of the academics on this thread feel as well.
I don't doubt there is the odd chancer, somewhere, who thinks they'll get away with just posting up the odd Powerpoint from 2 years ago, but they wouldn't last long in my place. Our jobs and reputations tend to be quite dependent on good feedback from our students about our teaching.
In all honesty I think that in 5 years time we will wonder what all the fuss was about, and why we ever thought that plonking a lecturer in front of 100+ students in a lecture theatre to talk to some slides for 2 hours was a good use of anyone's time.