This looks to be a very specific tool to check URLs on the command line. Terminal emulators don't care about that. Even shells running in those terminal emulators don't care about those specifics because why would they. One could easily want to do something with a funny url like that that doesn't involve content fetching etc.

If you can disable Unicode in your terminal emulator, then it will be. (Unfortunately, that won't help if you want Unicode in your terminal emulator, though.)