Q: Is this '170h x 188w' in inches or cm? Is this counted cross stitch?
A: This is the stitch count. It is not in inches or centimeters. it is 170 stitches high by 188 stitches wide. The finished size will depend on the fabric you use.
For example if you use 14ct Aida then there are 14 stitches per inch.
Yes this is a counted cross stitch pattern.