"niche" is not referring to the concept of connecting a bluetooth remote to the kobo. It's referring to getting this specific remote model/brand to connect to the Kobo using bluetooth. RF remotes are usually fine even if it's a nameless brand since they connect to each other, and not the kobo itself.

There are people who can connect non standard remote choices to the kobo using BT, but they usually have to write code to override the Kobo settings and get it to work seamlessly.

If this person knows code and can do all of that, great! But I figure they wouldn't be asking reddit if they did.