Boyfriend won’t stand up to his parents?

My in laws are currently getting a new house built with a granny flat (mother in law unit) built in the backyard. My partner is 1 of 6 kids. We are both 27 and have been together 4 years.

My in laws live in a different state.. a 10 hour drive away to be exact. They only moved states 3 years ago. We visit them twice a year. They have asked us to move states to be with them several times but we have politely told them we have everything set up where we currently live. The last time we had this conversation was about 10 months ago.

Their house and granny flat is due to be finished in 1 months time. My in laws often say to my partner over the phone - “you will have to cut the ribbon off for the granny flat for when you move in” or they will say to both of us - “when you move up we will help you get a job”

My partner laughed and said it was a funny and good idea to “cut the ribbon”. I’ve told my partner that he is leading his parents on and he needs to be firm and tell them we aren’t moving states to live with them. But my partner says it will just cause an argument and it’s easiest to go along with it because he doesn’t want confrontation with his boyfriends as he believes they will be offended. but I told my partner the house and granny flat will be build in 1 MONTH. He can’t keep putting off this conversation.. but he also told me I shouldn’t be telling him what to say?

It makes me feel awkward because his parents will mention discreet things to me about moving up such as “you will love the shopping mall here”.

I have wanted to say something but my partner tells me not to.