I have already answered this question above: “I have never published or reviewed a paper in its journals, not on any of its editorial boards.” Looks like you didn’t quite read my comments. Let me add more information: I have published plenty of papers. I have no relationship with MDPI. I do not know Lin in person. My interest in this case comes from 1) I have been a long-time follower of your list; 2) I am familiar with the Fang Shimin and Yiming’s work.
Of course I use Jinhai Gao as my pseudonym, for the reason I explained in my previous response.