Compare it to the way you'd be able to recognize from someone's speech that (s)he's from Texas. You wouldn't want a (beginning) student to learn Texan English/American. You'd want him/her to learn to speak the language without any specific regional emphasis. In the UK you'd probably call it the Queen's (or the King's) English. I'm not sure what the equivalent standard for the US would be called. (In Dutch this is Standaardnederlands.)
Most specifically it's the Robot lady's pronunciation of the 'G'. In Dutch it's quite guttural and perhaps even a little harsh sounding. In the southern parts of The Netherlands (as well as in Flemish) this very Dutch sound gets softened.
My remark above was specifically made out of frustration. Though I am fluent in Dutch I was not able to clearly make out what it was that the robot lady was saying. I remember that she was talking about 'dozen' (cartons or boxes) but it sounded a lot like the way someone from Tilburg would pronounce 'douchen' (which means showers or to shower). The way the word 'water' is pronounced is not correct. It's as close to how you should really pronounce it as 'wutter' would be to the English word for 'water'. You'd probably understand what is meant but you wouldn't advise people to pronounce it that way.
While I breezed through the 'English for Dutch speakers' course, I couldn't believe that the other way around was giving me such a hard time. So I'm sorry if I stepped on any toes. I know a lot of people put in a lot of effort to make this course available and to have some of it botched up by a 'not-so-good' text-to-speech synthesizer is not... very nice.
Make Google pronounce this tongue twister to get a better example of the Dutch G-sound: https://translate.google.nl/?hl=nl=0#nl/en/Grote%20Guus%20graaft%20grote%20gaten