"He hasn't been observed to be nursing in several months."
In the video, Makani is persistently begging for milk - which is not normal behavior in an orca who's been weaned for months. In response his mother, Kasatka, ignores him, listlessly floating by and eventually settling in the far corner of the tank. As the team watches, she turns toward the surface and begins to float, vertically suspended and motionless. Makani begins to circle her, somewhat frantically.
On SeaWorld's website, the park claims whale calves stop nursing by age 1, and only sometimes continue until they are 2 years old - a claim SeaWorld uses to justify removing calves from their mothers well before they should. If Makani, who is nearly 3, was nursing just a few months ago, that disproves SeaWorld's own claim about orca behavior. Naomi Rose has also confirmed that weaning in the wild is highly variable, but that wild orcas can nurse for as long as five years.
But of course, the issue here isn't whether or not Makani is nursing - it's the pair's unnatural behavior. Makani is asking for milk - and his mother is ignoring him.