Can anyone offer some insight as to why that junk paper was submitted in the first place? Are the authors trying to farm reputation somehow? To what end, and does it actually work? Are the authors even real people? What's their goal?
MDPI also spams anyone it thinks might be willing to submit a paper or serve as an editor, and does not seem to care much about the quality of the submissions it receives.
The modern academy is fucked, the whole system is being gamed and very little is being done about the mess created. The author here is fighting a tough battle and I wish them continued success.