I agree with that. What you have to do is play the character actively suppressing their emotions. Nimoy pointed out in I Am Spock that upon reviewing the original show he noticed that Spock would often swallow when Kirk was in danger, so there was this subtle "tell" that Spock was concerned even if his face was a mask.
The Kolinahr is not elimination or purging of emotion (the explanation of which may have been simplified for human consumption), but control.
Stoicism is a mask, and logic is a diversion.