From the linked article: "In a letter from Nikki Haley’s campaign manager Betsy Ankney, the corporate-funded plan to use “open primaries” is not only admitted, but also espoused as the core element of the Nikki Haley strategy."
It is my understanding NH has a one-day residency requirement to vote in a primary. They can bus in a bunch of liberals from MA, put them in a hotel over night, and have them vote for Haley.
https://theconservativetreehouse.com/blog/2024/01/23/positively-stunning-nikki-haley-campaign-manager-sends-letter-saying-the-haley-plan-is-to-use-open-primaries-and-democrats/