That is a sad story.
Acacia was named for the iconic thorn trees of Africa. That was first. Taxonomists decided to move the thorny type specimen to Vachellia … because you can’t expect Australian horticulture to change all their labels!
https://www.inaturalist.org/taxa/489561-Vachellia-tortilis-raddiana
We have to learn new names for our plants. And fend off invasive alien Australian wattles, which are called … Acacia!