Sorry, this is not as good as you think. This increase is likely a combination of like 10% of the population emigrating in the past few years and a new flow of remittances from the United States (recently allowed under Biden). Cubans are going to the US and getting jobs to send money back to their families, giving a direly needed capital injection to the Cuban economy but also making them more reliant on the US.

Through the growth does seem improbably large even considering that, I think the world bank has trouble measuring semi socialist economies like Cuba