It is visual only. You do not actually get logged in as that person outside of seeing the name and some stats.
I think they would act much quicker if it allowed full access to the other users account.
I'm not convinced that it's only visual. You get all of the profile options applied. The problem only lasts for a single page load though, and you're always on the home page when it happens, so there's not much you can do, at least not without some effort.
I assume it's just a caching issue with cloudfare serving cached pages from with the cookie or token from the user that was logged in at the time of caching on the cdn. You see that cloudfare cert because ocn is probably using tld redirection with cloudfare which is totally normal, they just need to fix whatever the caching issue is. I'm sure tons of VB sites use cloudfare, can't be too much to figure out surely.