A survey like this has no standing in law and it sounds as if it was just used to either gauge the opinions of residents or get the conversation going or both.
Tenants may not have a vote but their opinions are important – or they should be. For most schemes, a survey like this would be the only time ALL residents’ views were heard.
Your only problem is if someone on the committee says the majority of people are in favour and therefore the proposal had been accepted (which could be very easily knocked over at the tribunal).
The proposals still have to go to a proper vote at a properly constituted meeting at which tenants will not even be able to speak, let alone vote.
Surely it’s better to have a straw poll to get a sense of the residents’ feeling than it is to just present them with a proposal conjured out of thin air. I would applaud the committee for making the effort to find out what people think.