Yes and no
If someone tells he invented/created everything and later you find out it was "just" copied code where copyright information was removed - what would you think ?
As mentioned before, he earns some kudos to implement/merge the stuff into his code, but it's no "reinvention of the wheel" and it's neither "excellent code" nor "excellent coding".
All of these blockchain based coins have to do the same thing. of course code is going to be similar.
You are looking at the wrong code.
You can't deny there is innovation happening within the Zerotime locking code, chainblender, and Zeroledger.
Also, this is not just some theories on whitepapers or vaporware. The guy actually got it all to work. and you can download it. now. today. and use it!