Dodic, there's no pathing in that tutorial, all the monster does is turn to face you... (sneaky way of making sure it never falls off the matrix)...
I don't know where any tutorials for this are, but pathing just needs objects that are hidden, (the computer still knows where there are) and when it touches one, it looks at the next one then moves towards that. How you make it know which point is next, is up to you.
Just make sure you path objects are at a point at which enemy characters can collide with them - if you've coded in your gravity, and your path point is too high, it will probably just move under your node and look straight up at it...
...maybe one day I'll finish a project