Not directly but you're close.
Time Freeze is an AOE Stun. Stun is a type of 'hard' crowd control.
When you hit enemies with 'hard' crowd control, they become immune to most additional crowd control measures. This looks likes white swirls around their feet. For instance, Pulls won't work.
Tanks are generally expected to Pull enemies into easier to kill tight formations for the group's AOE damage abilities to hit them all at once. By giving a spread of random enemies temporary crowd control that means they stay where they are or can go wherever they want once the Stun ends, for several seconds.
They should have offered to explain a bit, it's not super clear from in-game prompts.