Curious who "they" is ? Whoever told you that thinks they're doing you a favor "Don't spend days writing a thesis because we won't really know what to do with it".
You'll get a lot further by talking to your representatives on the council. Here in Australia they're very accessible, they publish an email address and phone number and are fairly responsive.
You basically want to tell them that you have some concerns and ask where they are in their approval process. There's a range of possible answers which will be disappointing. One is that they already did environmental and social assessments and approved the development a year ago. Another is that the land is already zoned for this use and they can't block or approve any specific plan for the property.
That said, they might tell you that there's an upcoming request for public comment, or that there's a semi-formal group of people that have already expressed some concerns and you might be able to slot in with them.
Alternatively, ask them whether they have any concerns, and what benefits they think the centre will deliver. At least then you can address your letter to the rep you spoke to and speak directly to the benefits they're seeking.