MLS changed their roster rules a few years ago. A player can be drafted and return to college for 1 additional season. If the player were to remain in college for a 2nd season after being drafted, then the player would re-enter the draft is my understanding. Remi has the collegiate eligibility, but I don't expect he would return for a second season after being drafted by San Diego.
As I recall, Dyson Clapier and Malik Henry returned for the Fall 2024 season after being drafted by Sporting KC and CF Montreal, respectively, in December 2023 (MLS 2024 Superdraft). Malik ended up at Toronto FC through a trade, not by re-entering the draft, https://en.cfmontreal.com/news/cf-montreal-acquires-up-to-75-000-in-general-allocation-money-and-third-round-pick-from-toronto-fc)