What are the top voted comments on closed questions, and who made the comments?
SEDE has two great features that you should incorporate into your code:

Input parameters
Magic markup columns


Input parameters
SEDE lets you declare fields to be input towards the query, like so:
##Parameter:type?defaultvalue##

And so, I suggest you use three of them for the following things:

Threshold (The threshold of comment scores to select)
Amount per page (The amount per page of comments)
Page number (To go with the above one)

By using pages, you can simplify your returning dataset and help to reduce the massive call times of the query.

Magic markup columns
SEDE has a great feature where certain columns can be transformed into special markup. The specific columns are:

Post Link (generated from Post Id)
User Link (generated from User Id)
Comment Link (generated from Comment Id)
Suggested Edit Link (generated from Suggested Edit Id)
Tags


As it stands...
your code is good, but you are doing a few things you can improve on:

Your generation of Commenter can be easily replaced with UserId as [User Link] to save extraneous calling of another table.
SELECT Id, ClosedDate your SELECTion is redundant. To use the field, you don't actually have to select it, simply reference it. Seeing as the resulting table is only used for the Id anyway, it's pointless to have it.