Yea, no, maybe...
As someone here pointed out, the XV is kind of a tweener when compared to that subset of vehicles. The HR-V and CX-3 have wheelbases between 101"-103" and overall lengths under 170". Subaru XV has about a 105" wheelbase and 176" overall length while CX-5 measures 106.3" and 179".
Subcompact CUVs are starting to fall into two different size classes now. I'd put the CX-3, Juke, CH-R, Fiat 500x in the small group, and I'd put the HR-V, Crosstrek, Renegade, Soul in the large group.
I don't think length is a good metric for categorizing vehicles into size classes, because the size metrics that people care about when buying are passenger space, leg room, head room, cargo space. The HR-V and Crosstrek are very close to the same in terms of interior space. Crosstrek has slightly more cargo space and a wider back seat, while the HR-V has more rear legroom.