Need a little help with understanding Dutch knitter working with English pattern

[Flod]

Hi, Normally I have no problem understanding English written pattern's, but this one is a mystery to me! I feel a bit silly because I knit all kinds of complicated English lace-patterns with no problems.

So this question seems  a silly one, but still it leaves me puzzled:
 
It say's: work back in purled stitch. Isn't that the same as the garter stitch? So I purl every row? Then why not knit every row? I can't comprehend why to purl every row, when knitting has the same outcome..
Or is this some pattern stitch I don't know about yet? (turned around stockinette??)
Thank you for your time!

[ajoursteek]

Hi, maybe they meant: purl in the back of the stitch? It's a guess... But maybe you already found the solution.