Color me extremely skeptical. The only way that these poll numbers make any sort of logical sense is if people mistakenly think Statehood is going to see Puerto Rico's existing debt be assumed by the Federal government. Even H. R. 4901 is quite explicit that the State will inherit the Commonwealth's debts as has been the custom when territories have been admitted as States.
If anything, Statehood will make Puerto Rico's debt crisis worse. As a territory, the interest on Puerto Rican debt is exempt from Federal, State, and local income taxes, but as a State, it will only be exempt from Federal income tax. That tax exemption is part of what made Puerto Rican debt attractive to many investors and helped encourage the Puerto Rican government to take on too much debt.
I realize
PROMESA is unpopular in Puerto Rico, but Statehood won't make the situation that made it necessary go away. Once debt is back to manageable levels, Statehood would hopefully help keep the island from falling back into a debt trap, as financiers would have less reason to encourage the island to take on debt.
If Puerto Ricans are looking for a quick fix to their island's debt crisis by a change in their relationship with the U.S., then independence (with or without a free association compact) would be a much better option than Statehood, tho it would come with other drawbacks.