This area has cooler water due to more upwelling due to westerly winds. This is what I posted in the Beryl thread. The area extends a bit east of the peninsula and north of it. Throw in some dry air with this and you don't get a lot of deepening.
The coastal area north of Yucatan has experienced a cooling SST trend from 1982 to 2015 during the upwelling season (May–September) that contrasts with the warming observed at the adjacent ocean area. Different drivers were analyzed to identify the possible causes of that unusual coastal cooling. Changes in coastal upwelling and in sea-atmosphere heat fluxes are not consistent with the observed coastal cooling. The eastward shift of the Yucatan Current observed over the last decades is hypothesized as the most probable cause of coastal cooling. This shift enhances the vertical transport of cold deeper water to the continental shelf from where it is pumped to the surface by upwelling favorable westerly winds.
https://www.sciencedirect.com/science/article/abs/pii/S0924796317303317#:~:text=The eastward shift of the,by upwelling favorable westerly winds.