I was there beginning of February 2021 and did not see these shirts at all.
Since you can customize the color, I‘m thinking the shirts may be printed on demand.
Was there the week before Easter and did not see them in any of the shops we visited. Contemporary, Grand Floridian, Poly, Wilderness Lodge, Boardwalk, and Riviera.
FYI ordered the men’s version, protest in a sense as women’s version had the typical upcharge.
While it fit as expected & washed/dried up well, the men’s does not the softer prima cotton type feel. Not that it’s necessary scratchy, just wouldn’t have ordered it if I realized that.
I bought a personalized one online in February. It's soft, didn't shrink much and I wear it all the time. I got the rose one. It did take a little longer to ship (1-2 weeks) than everything else.