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 Is a pruned node a full node? 
 No 
 Why not? 
 For the same reason a 6inch sub is not a footlong 
 A pruned node still downloaded the whole history from genesis, but just stores a certain amount on your computer.
You can’t stuff all the ingredients in a 6inch 
 So you make a footlong and then cut it in half and throw away one half. You still don’t have a footlong 
 🤣👍🏽 
 I think the question was in regards to the degree of proof in your own ownership and security. In that case it is. But obviously it isn't a "full node" in the sense that it has the entire history, because clearly its pruned... [insert foot long analogy here] 
 In the context of your own security, yes. You have essentially proven that a recent state is verifiably the valid state with all real bitcoin, and then you've deleted everything upp to that point because you no longer heed it.

The only difference is that other full nodes can no longer request that info from you. But in regards to your own security, you've validated everything same as a full node. 
 Thanks for clarification.