If he did not get defeated why his army mutinied?Porus put up stiff resistance but did not defeat Alexander. You do not become governor/client King of a Satrapy by defeating the conqueror of the world. Makes no sense.
If he he didnt get defeated why he couldnt allocate a local governor?
If he didnt get defeated why he he couldnt assign a tax collector which he was doing for every region he conquered?
If he wasnt defeated why was the claim of victory written down 300 years after the actual event.
If he did not get defeated why didnt he go further east but rather turned south?
At best Alexander landed a stalemate in the Battle of Hydaspes ending with a truce or at worst defeated decisively .