The article reads like a propaganda to have media to have general people to make fuss about Meta's tax practice regardelss it is legal or not.
"Trend in tax break" in the article does not mean jack shit so long as it's legal. There are myriad of factors why the trend happens. Meta stock went up, more revenue in, thus more tax break as they pay more, the higher the tax percentage etc.
This article is pointing out that the practice is almost certainly illegal. These data centers are being used for production workloads, not experiments.