Old design - Here it says 4 comments on an X question.
The old design is better. Why it is changed?
I got 4 comments and 2 answers but only the latest is shown.
noredirect' parameter use in those link?
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I believe this is by design. You'll usually need to read the comments in the context of the post (and perhaps older comments as well), so it doesn't really matter how many new comments there are. Note that the number of new comments (or other events) will be correctly shown in the red badge.
noredirect parameter is there to prevent situations where you're somehow not logged in on the target site and the question is closed as a duplicate; without the parameter, you would automatically be forwarded to the 'original' question, i.e. the duplicate 'target'. That would be very confusing.