According to the article, the over 200 Venezuelans sent to CECOT (252 total prisoners - you can find other articles that state all are Venezuelan) were transferred to Venezuela and some people incarcerated in Venezuela - 10 Americans and an unspecified number of political prisoners - were exchanged.
According to NILC, there were at least 280 people sent from the US to CECOT so not all people have been released.
I wonder how many of those unnecessary pings are from data collection efforts. We should have protections that prevent our financial data from being sold but I guess if women's health data isn't protected then its not surprising.