Why the HMS Duke of Kent proposal sounds fictional

Why do people think the proposed 170-gun HMS Duke of Kent is fake?

Because its scale sounds implausible and a real paper design is easily confused with an actual decision to build.

The scale of HMS Duke of Kent makes the proposal sound invented. The underlying design work was real. A documented study still differs from an approved building program. Paper work can test an idea without creating a commitment to lay down a hull, a distinction that matters throughout unbuilt-warship history.