No.
They polled 197 Detroit residents about Detroit's Belle Isle State Park, but over 600 Michigan residents?
Guess who commissioned the poll? The developers.
"Under the proposal, investors would make a one-time $1 billion payment to the city in exchange for a long-term lease, and Detroit would receive an additional $50 million annually."
Sounds to me the proposal is for a bunch of greedy developers to take over Belle Isle State Park.

Poll: Majority of Michigan voters back plan to turn Belle Isle into ‘special economic zone’
A majority of Michigan voters and more than two-thirds of Detroit voters support a proposal to turn Belle Isle into a “special economic zone” featuring high-income, mixed-use housing, entertainment and a retail district, according to a poll released this week.