The comic is a four parter like 'Countdown' before it, so I would assume whatever explanation for April's statement they've concocted will emerge somewhere in issues 2 - 4.
If he's actually Robert April of course (coz.........ya NEVER know!)
'If the Apocalypse starts, beep me!' - Buffy Summers
'The sky's the limit.....' Jean-Luc Picard, 'All Good Things'
courtesy of Saquist