11 month for a long-term investor is not a term at all.
I believe that you should keep coin at least three years to take really good profit.
Don't lose your trust, Lisk is a strong and useful crypto, I think everything still ahead for Lisk.
I also believe that 2018 will be year of altcoins (and ICO bubble collapsing, haha)
He didn't imply that he is going to sell anytime soon. But check where LISK was 11 months ago, this guy has some nice green figures on his balance sheet