Why does SharedMemory use ABbdZW8gJcXEB9XkRZLwDDuGmom3hBwWEsG2y49bHv45

We noticed that class SharedMemory used ABbdZW8gJcXEB9XkRZLwDDuGmom3hBwWEsG2y49bHv45 as program address. But in https://solscan.io/account/ABbdZW8gJcXEB9XkRZLwDDuGmom3hBwWEsG2y49bHv45, seems it is not a program and just one address. Its latest transaction happened 3 years ago. So I am curious why you are still using this address.