There have been a few studies of Cuba conducted on the island, rather than the Miami diaspora. Predictibly, they are less Euro than Miami Cubans, but still very European by Ltin American standards.
Here's a 2018 study with 1,019 Cubans on the island representing all fifteen Cuban provinces (other studies give similar results, this is just the first one that came to mind):
https://www.nature.com/articles/s41598-018-29851-3#Sec9
"On average, the proportion of European ancestry estimated across all Cuban samples was 71%."
(compare this with 85-90% Euro for Miami Cubans)
This varies significantly by province:
"The highest European ancestry was observed in Western provinces such as Mayabeque (on average 87.7% SD = 9.6%). In contrast, Fig. 2c shows elevated levels of African admixture among individuals from La Havana (on average 27.9% SD = 27.7% across 72 individuals), and the Eastern provinces of Santiago de Cuba and Guantanamo (on average 38.8% SD = 24.0% across 88 individuals and 40.1% SD = 25.2% across 54 individuals, respectively)"
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