I'm close with programming. But this explanation with the "multi" really looks fun. And it's not clear.
As I understand they do not use one blockchain, they use many blockchains. Thank this the spead of transuction is very high. It is a new techology and now it hard to understand how it works. In some time it may become so usual like blockchain in Bitcoin. It start to appear cryptocurrencies with many blockchains.
You're right. It is difficult for us to understand the new information from the first time. Therefore, the OPTHERIUM project team regularly publishes news and articles, so that we can explain everything.