It's highly recommended you bring gear, not only for yourself, but to leave behind for the local Cubans.
CubaClimbing.com, PlanetMountain and others all pretty much say the following:
To sustain the local climbers, please pack extra climbing gear and
leave it all behind. The Cubans need climbing equipment, as it's
impossible to get it locally. The majority of visitors now follow the
tradition initiated by the first visiting climbers, who left their
rack, ropes, shoes and harnesses in Cuba. Try it—you will feel very
gratified. Some suggestions: Most useful are the basics: shoes,
harnesses, ropes, chalk, pads and packs. However, the single biggest
need to propel Cuban climbing forward is bolts and hangers.
So, basically, don't assume anything is available, and bring all you need.
Sources above, and also I was in Cuba earlier this year. Incidentally, it's changing very, very quickly so for future readers, do actually check those sites as the information may update/change soon.