If you pay attention to the network of sidechains being created on xyz
Dero is a layer 1 solution and a platform, not a layer 2 solution on another's platform
CapDero wrote a blockchain from the ground up... but that is not what really happened.
A quote from our lead developer "Every part of the DERO blockchain from P2P protocol, Consensus protocol, POW, Forking, Security, Scalability, Wallets is being re-designed to meet DERO vision." So, everything was written from the ground up, and many things were fixed, adjusted, changed, and so on
They forked off monero and translated it to Golang changing a few things.
Essentially everything was changed (already), and in the not so distant future perhaps we can literally say "100% of everything"
If you have any questions about what Dero is, please don't hesitate to reach out and contact me. I think there may have been a misunderstanding in a few particular areas like the layer 1 vs side-chain comment. Let me know if I can be of any help!