Both as a joke but also in seriousness: if the Nicaraguan army can't figure out where the border is, how is Google meant to know?

In practice a key part of the army's job to decide where the border is. The commander is scapegoating to hide his own incompetence. Google's mapping may have contributed, but the lack of demarcation showing where the border is would have been a bigger issue. If the Google Maps aspect was enough to end up in the wrong country it was going to happen without Google being involved.