In that thread, there is another link to this existing FR: Global (Mass / Vault-wise) search & replace - #9 by WahWah
I can merge your request in there. Unless you think that your request is distinct enough to stay unique. This is a specific use-case of that more general feature. A specific feature to transform tags/links could certainly be useful and friendly to many people.
This is where Obsidian’s structure is accessible. You can already use any popular code editor or IDE to do mass search and replace, as a workaround for now.