I've seen this post you liked to before months ago. Harbor City was cancelled due to hardware limitations on PS2. The games use of a very large scale map and having areas connected by highways to different locations didn't work the way they wanted. The online also was a problem here. This beta version of Harbor City is more of a holy grail if it's found similar to Resident Evil 1.5, or Castlevania: Bloodlines beta copy. People would pay astronomical amounts of money to obtain any of them to mass produce copies as an exclusive rom or system port to the fan base. Other than the Castlevania I mentioned above have been seen in real life. Fortunately a portion of Harbor City was released to us in TM:HO twisted edition. Also TM 2012 has fully functional remade maps of Harbor City in it.