The Seychelles have been a tourist destination for a while, and since they’re a very high-end destination I doubt that tourists alone would push its alcohol consumption to world-leading levels.
However, the Seychelles have other societal issues (mostly related to an over-reliance on tourism and virtually no other industries being present) that have likely increased the alcohol consumption of their own population over the years. In fact, it’s not just alcohol but other drugs as well. In 2018, it was estimated that One tenth of the total population was abusing Heroin. All of this obviously got much worse when tourism disappeared because of covid, but that’s not even in the chart.