There's a study¹ that determined the fate of 350 manuscripts rejected by the Annals of Internal Medicine. They found that 69% of them were eventually published in another journal. 70% of those were published in more specialized journals with lower impact factor.
It appears the reviewer took a similar approach. The manuscripts were published between 121 and 1792 days after rejection, with a mean of 552 days. The letter to the plagiarist says the article was published "a few months later" so that would be approximately 90 to 120 days?
I really like this way of going about things. Tons of stuff is available to anyone, conferences provide great opportunities to exchange ideas and see what others are working on, and journals don't have the enormous power they enjoy in other disciplines.
There were many reasons why neither I nor the authors of the original paper pursued this issue.