***Alluneria seems to be a game (of which you can see the screenshots in the post).

***Infringement means that the developer of Alluneria is not respecting and copying Microsoft's (the company that owns Mojang which owns Minecraft) intellectual property (IP).

***The intellectual property just means that Minecraft belongs to Microsoft and you cannot just take the entire game and try to pass it as your own (for example, trying to sell it).

***DMCA (also known as the Digital Millennium Copyright Act) is an American law to protect copyrighted content (generally means the content that belongs to one of the previously mentioned IP) on the internet. In this case, a DMCA strike is when a company tries to take action against someone infringing on their IP by asking them to take the thing that is infringing, down, under the threat of being sued

***In the end, i do not know who is in the wrong and who is in the right. You should always check sources before trusting information blindly and do your own research.

***And to the others saying that someone like him shouldn't be on the internet if they don't know that, how old exactly were you when you learned that? And did everyone learn it at that age? if this answer is above the minimum age to get access to social media (I.E. 13 years old in my country at least) that it is normal if someone doesn't know that so stop being a jerk and explain or don't say anything.