Only $100,000 per-month is less than 20 to 30 peoples wages per-month. Got more than people to pay than you're bringing in? Then they're losing month every month.
He said they were making a profit of $100,000 per month - not bringing in $100,000 in revenue.
Wii-U was a gamble, and it looks like it will not pay off. System is tanking and will continue to tank, and Nintendo will likely start writing titles for Xbox and/or Playstation and/or mobile devices.