Satoshi wrote in 2010: "I don't believe a second, compatible implementation of Bitcoin will ever be a good idea. So much of the design depends on all nodes getting exactly identical results in lockstep that a second implementation would be a menace to the network.”

As this will obviously not be a mining or even full node what is the benefit? I guess why? 

 This will not be a second implementation. It’s bitcoin core 

 Bitcoin core is available here: https://github.com/bitcoin/bitcoin

This is a mobile implementation of Bitcoin core from what I can tell, but it IS NOT Bitcoin core and to claim it as such is dishonest.