It was over three years since the last update... That was long enough! But it's actually really easy to update it using Excel. To anyone who might update the first post in the future: Please keep the tabs!
First, I needed to get everything into their own columns in Excel. So I copy/pasted the entire list into one column, then used the "text to column" tool and separated by spaces. This got it most of the way there, but any username that had spaces in it got separated into columns. So I just manually went through to fix those. Now everything is in columns. When you copy and paste columns to text (like Notepad or this forum's reply edit field) it will input a tab in between each column. When you post the reply the forum will automatically convert the tabs to spaces, but the tabs will be preserved when you go to edit the post. This is important because when you copy it back to Excel with the tabs everything will go into the correct columns again, making it very easy to update.
For anyone that might update in the future, here's what I did: After getting everything into columns, I went through the posts since the last update and copy/pasted the usernames into the username column and whatever the associate count was. Then after I got them all, I sorted the usernames alphabetically. Then I created a rule for the username column to highlight duplicates in red. Then I just scrubbed the list manually for the duplicates. If you highlight the feedback count column, Excel will show the sum. I just quickly inputted the totals for whatever duplicates there were, then delete the duplicates. I know that there's a remove duplicate function in Excel, and I'm sure there's some slick way to use that and somehow total everything at the same time, but the way I did it was easy and quick enough. What really took long was the fact that the last update was over three years ago, but it still didn't take very long (maybe an hour).