I like how all the others are countries. What does that tell you?
Good catch. Strange omission of sorts. I would hope that any professional writer would catch that mistake prior to publication. Here is the link. No data.
https://www.tripadvisor.com/Tourism-g147237-Caribbean-Vacations.html
Data
The 10 Most Visited Caribbean Islands
1. Dominican Republic,
Actual 2017 stay-over tourists: 6,187,542
2. Cuba
Estimated 2017 stay-over tourists: 4,700,000
3. Jamaica
Actual 2017 stay-over tourists: 2,352,915
4. Puerto Rico
Estimated 2017 stay-over tourists: 1,672,707
5. Bahamas
Actual 2017 stay-over tourists: 1,335,933
6. Aruba
Actual 2017 stay-over tourists: 1,070,548
7. US Virgin Islands
Estimated 2017 stay-over tourists: 874,094
8. Barbados
Estimated 2017 stay-over tourists: 642,350
9. Martinique
Actual 2017 stay-over tourists: 535,646
10. St. Maarten
Estimated 2017 stay-over tourists: 528,154
https://www.caribbeanandco.com/10-most-visited-caribbean-islands/
Not included the overall Cancun area.
About 4.8 Million