He actually sounds...
...like he's ill memory wise. Not because of the computer stuff but having to be prompted by an aide that "You do know this stuff, we told you earlier". But as the Japanese have always appeared a strike culture and proud, their government probably doesn't want to admit his not fit for the role.
On the "Today any company president uses a PC", isn't exactly true. Apparently, so he said on a documentary, Warren Buffet doesn't have a PC in his office. He's made his billions just reading the financials of companies in papers and other media before deciding to invest or not.