It's a Remarkable 1. See https://support.remarkable.com/hc/en-us/articles/360006761638-Which-file-types-are-supported-on-reMarkable-

Anyway, I think this discussion is missing the point. You are actively sabotaging a browser feature because you think know better than your users how they want to interact with your content. It's like disabling right or middle clicking or hijacking the back button.

You're of course free to do whatever you want, especially on your own personal site. But I think you can see from the rest of the comments how people feel about this.