Wikipedia is all about having sources, it doesn't seem to matter so much if the sources are any good or not, so long as you have them. The thing to do wouldn't be to write an unflattering article on Alex Plank, but to edit the Wikipedia entry on Wrong Planet itself to describe the criticisms and controversy surrounding it, and backstop that with several web pages questioning the value of WP and discussing those specific criticisms. Given Alex's reactions in the past to changes to that Wiki article, that would most definitely draw his attention, the discussion page on Wiki is quite detailed about his efforts to sanitize WP's entry before.