I may be wrong (though I doubt it), but I would guess Ned has been far more interested in lining his pockets with dirty fiat than hiding stake on Steem. If he actually had any interest in Steem, he would have actually invested in building it instead of looting most of the funds, and then lying (or hiring someone to lie for him) about needing layoffs, slow development, no marketing, and "survival model" due to being out of money

Any hidden stake is stake he could sell with no accountability whatsoever. No reason to think that he didn't.