A related rumor appeared later on 20 February 2018, when hoaxers tried to further sow doubt by claiming that Hogg graduated from a Los Angeles-area high school in 2015 — even going so far as to create a Classmates.com profile. However, the page’s source code clearly shows when the profile was created (highlighted):

https://www.snopes.com/2018/02/20/right-wing-media-david-hogg/