Could be, IF the marked date does not mark their debut date but merely their reveal, it leaves her a bit of time before her debut in Gen 3.
Invaders debut timeline was :
>10 May, Teaser Trailer, marked for 05/2023
>16-17-18 May, silhouette reveals, marked for May 27
>21 May, Models reveal trailer
>27 May, Invaders Debut
Judging from it, this would make meru's anniversary birthday stream not as close as her debut as I previously thought.