Yes, it does mean the the sandal does run a little bigger and a 9 will fit someone who where's a 9.5 .
The Hurricane XLT runs more than a little large. I am nearly always a size 12 and, occasionally, a 12.5 in every casual, dress, hiking, or athletic shoe/boot. In these sandals, however, the 12s are HUGE on me. I could easily go down to an 11 and perhaps even a 10.5.