Deletion of Silesian metropolitan region

Comment: this is almost entirely a  |synthesis of information.  Expanding the article will not ameliorate matters as it's an unsound concept for an article altogether. The region as defined in the article doesn't correspond to any governmental or administrative region.  The main source used to "define" the region doesn't even use the term used as the title, and the area is "defined" as a convenient hypothetical construct for this one particular paper, which itself does not seem particularly notable
Stance: delete
Cited policy: Wikipedia:No original research (WP:OR||WP:SYNTH)