That's what always stuns me about these instances. Eight years, presumably thousands of tweets in between, and probably not a current pattern of similar tweets, so how and why do people unearth these things?
Why would anyone even be looking for them? Do the posts pop up in your timeline as a reminder of something you did on that date, like Facebook occasionally does?
If someone was mad at them and wanted to drop the hammer, have they been sitting on these things for a decade? And if so, why now instead of at any point along the way?
Is there an army of folks whose job it is to comb Twitter for potentially offensive tweets from every semi-public person?
It boggles the mind.
Find someone you want to discredit. Use the search function mentioned above.
The giveaway is usually the offending words. The more esoteric, the harder someone had to look.