Are "oil colours" the same as "oil paints," or am I buying pigments by accident?
Basically, adding oil to ground pigment will turn it into oil paint; adding acrylic to ground pigment will turn it into acrylic paint; adding water to pigment will turn it into water colours...

So, this should be oil paint if it contains oil, and not just pigment.

(Where did you find this? Isn't there a description to the product? An image? If this is what you've been looking at, yes this is oil paint.)