The article never explains what “PR” stands for, and only incidentally uses the phrase “public relations” about halfway into the article. It seems to be an article written for journalists, not for the general public.
We all have different words that we are unfamiliar with of course but “PR” is most accurately categorized as an economics / marketing term IMO, and I think the meaning of the word “PR” is widely known so I don’t agree that the article is written for journalists based on that alone. I generally agree that abbreviations should be explained on first use but personally I would not bother to have explained what PR stood for because I (perhaps incorrectly) would have expected that word to be so widely known that no explanation would be necessary.
I thought they were moving to Puerto Rico, and wondered why they would pick now to do that