It says the information was sourced from a former twitter employee. That might just mean that they knew that the twitter server has some endpoint that literally

It says the information was sourced from a former twitter employee. That might just mean that they knew that the twitter server has some endpoint that literally sends you a list of all the alt accounts(at least, per [0]) and they all share a single user id [0] https://twitter.com/travisbrown/status/1515218000001081346 https://twitter.com/travisbrown/status/1515218000001081346