April Fools only lasts till 12:00 midday in $localTimeZone and everything beyond that makes you the fool. We're well past 12:00 midday on 1st April (in any time zone) so just like mid winter festival hats it should all be put away in it's box till next year.
I would vote for closing and deletion.
It also creates a precedent. This year we had one, it gained some popularity and a few people gained some useless internet points. Next year there will be more especially if it's left to stand. The power of UIPs is huge.