So how does the fact that the tech is valuable make the coins valuable (which is what it seems you suggested in your post)?
They aren't coins. They are tokens, or keys, which enable you to utilize that specific technology*. They are also of finite supply. If a specific technology, or blockchain, is in high demand, then the limited tokens to use that blockchain become more valuable.
* without getting too deep into it, they are pieces of the blockchain. So technically, you own a piece of the technology. The only way to utilize (some of) these technologies, is to have that code. People call them keys, tokens, coins, or by blockchain-specific terms,