>>46487436"Lung dragon" is literally "dragon dragon." The author is only calling them that to avoid pissing off Chinese, Japanese, and others in the eastern dragon tradition, because this model people have set up excludes them.
The thing is it's always pointless endeavor to try and classify dragons. Dragons are vague and diverse and defy classification. They're more a metaphor than anything resembling a species.
Heck, most of the terms used on here basically translate to "snake" if you do etymology on them.