I'm inclined to agree. De Costa is tendentious. He may have read volumes about the mining biz, and may have talked to dozens of geologists and mining engineers, but he's still an armchair observer, and one with his own preconceived notions about MDMN's properties.
Given the amount he's read, not to mention written, about naked short selling, you'd think he was an "expert" on that as well.
But he's not. He's a clueless crusader.