The article seems to be written from the standpoint of a conference organiser. Which is quite different than the perspective of a learner.
As someone who hasn't attended a single tech conference in my life, yet watched hundreds of recorded talks, I think the point of an online conference is to create an occasion for people to produce high-quality content in their field that others will enjoy watching. I would, of course, prefer that these people created such content regularly, without needing to be prompted by the occasion of a conference, but very few do.