My info i about 4-months old, so . . .
1) They still had non-dairy shakes, made from soy.
2) The chocolate was tasty, the others (taste-wise) were suitable for finger-painting on the table.
3) However,
. . . they don’t use dedicated mixing/blending equipment,
. . . this is not like a separate kitchen area, kept only for allergies (such as nut allergies)
. . . however, they will clean/rinse the blending blades/wands prior to making the shake
. . . but, I guess, there is always the chance for potential cross contamination