Does the air cond piping leaking in the wall covered by developer within warranty period?

I talked to the main-con and he said the warranty void because I replaced the air-cond (developer provided a default air cond which was replaced without use).
His logic, I replaced the default air cond and hence internal piping leaking no longer covered.
Apparentlly replacing air cond means you shaking shaking the air cond and hence piping leaking is your own fault.

Is there any truth in his remark?

The the contractor that installed mine confirmed nothing to do with him.
He was not the taichi type because he actually spent time working on another ac that has some gas leak.

below air cond has dry surface and no water anywhere.
slightly over half a meter down, can see water inside the painting and water leak out of the switches due to hole/gap.

i tried to take the photo in 1 but then it would be difficult to see the water mark. I cant get a full picture that still able to show the water mark clearly.

From the connection at the wall, i think the drain outlet go down and bend towards the door, before going down beside the door frame.
the other side of the door is a toilet, so the drain water piping should be going there.

so far still no people with experience or any solid ground why replace air cond will void the warranty on the internal piping within the wall?

maybe the main con trying to kencing me.
I am still waiting to meet the developer manager about the update/status.
the main con very confident and said when the developer send him the defect form, he confirm will reject it.