lots of land vendors/developers have special rebates, something like, we pay the stamp duty for you etc. They are perfectly within their rights to do this.
Trouble is, the buyers think they can use the money being returns as 'funds to complete' the purchase, when being assessed for home loan eligibility.
They can not, and if the bank finds out about the rebate, they will reduce the loan amount/LVR/valuation further.
The client has to have the funds to complete, in their bank account. If their bank account swells after settlement from the rebate, this is irrelevant.