Who said that April fool can only be funny? We have a little idea about Theymos don't we? obviously, he's not joking.
what's wrong with using this event in an unconventional way since a lot of members are anticipating it. I would say probably he wanted to raise more awareness about this virus since, even at this stage of contagion, some people are still not taking the matter seriously. Personally, I like the initiative and support it, will try not to get infected.