Strange, their financial position doesn't look bad ... yet. I mean, it's still an hypothesis brought up by rumors so we'd need veracity first before I make a claim.
Apparently they're not talking about layoff, but employees quitting. Could be that the management and work conditions there are terrible (which wouldn't be surprising in Japan, remember Konami-Kojima), and/or that other companies are targeting their employees for hiring with better conditions.
Japanese people usually don't quit their job, it's not in their culture, so something pretty bad must have happened.