Is this Quercus coccifera?
Yes. That is definitely a Kermes Oak / quercus Coccifera.

It should start blooming in a week or two, in case you're still in the area by then I recommend checking it out.

It is thriving in that area specifically because it's a dry area, otherwise they tend to be pushed out by Holm Oaks / Quercus ilex.

The combination of the area (see below), habitat (dry hills) and picture (especially the acorn cupule) are pretty conclusive and support your original assumption.