It looks like the creator is counting any decrease in dislikes over time as manipulation, without a firm understanding of how large scale systems work. Say for

It looks like the creator is counting any decrease in dislikes over time as manipulation, without a firm understanding of how large scale systems work. Say for example I used a batch of 100 HN accounts to mass downvote your comment. After a while an hourly job runs that looks at all those votes in aggregate and determines they were coordinated (for simplicity sake they all came from the same IP) and removes them. You'd see a large shift in the net score of your comment all of the sudden. This isn't HN manipulating anything, it is them doing their job to prevent abuse on the platform.