Hmmm....I just copied this from the article:

The e-Gates are designed to address the need for greater efficiency and growing demands for high traveller throughput, while the solution further empowers Immigration officers in being able to process upwards of six travellers in the same timeframe it would customarily take one passenger to be cleared through exit control. On successful completion of a transaction, the traveller may then proceed to Airport security screening and continue on his or her journey.
It seems to me that the last sentence "proceed to Airport Security Screening and continue on his or her journey tells me this is when departing St. Martin, not arriving. Last I knew (last March), you didn't have to go through Security Screening when arriving in St. Martin.