This question already has an answer here:
While reviewing questions in the review queue, sometimes StackOverflow will change the question dates and hide votes to test if the reviewer is paying attention or not.
While the date of the question is hidden, the date of comments remains the same as the original. So the reviewer can easily spot the mismatch and determine that it is a Test question.
Either we should change the comment date also or hide the comments completely.
In the screenshot, as you can see that question was asked a few mins ago but comments are 10 days old.