I was genuinely curious why grandparent would think that "I still suspect he stole the 18k bitcoins, the guy is slippery.". Why is the guy "slippery"? What make

I was genuinely curious why grandparent would think that "I still suspect he stole the 18k bitcoins, the guy is slippery.". Why is the guy "slippery"? What makes you think that he stole the bitcoins? Why would someone downvote for asking for clarification..?