You have a guaranteed controlling stake in the platform by owning 51% of the blockchain.
That is factually incorrect, a DPOS chain requires two thirds (plus one) of the witness positions to control consensus. Due to voter apathy in practice you need much less than that (much less than 51% in fact).
The 51% applies to POW and traditional POS chains not to the ones based on DPOS.
I am not trying to sound smart but it bugs me that a top witness would say something like that.