Increase in new gardeners in 2020
@Marjory Wildcraft this article might give you some insight into who the new gardeners are in 2020.
I think that it was interesting that many are highly educated & many don't have kids. I think, however that there may be many more who don't hold degrees (and have children) who were missed in the survey sweep.
I can see the new gardeners holding higher levels of education, as most likely they couldn't be bothered before the virus hit mainstream & affected livelihoods. They also might have found that they had more time on their hands & with no kids to keep them busy and no travelling allowed, what were they to do?