PERBIX's website already redirects to Tesla with a short description about the acquisition:

"With the acquisition of PERBIX, Tesla further advances its efforts to turn the factory itself into a product – to build the machine that makes the machine.

Founded in 1976, PERBIX, now a part of Tesla, designs, builds and services highly-automated, high-volume manufacturing machinery that will help Tesla accelerate the world's transition to sustainable energy."

It is no secret that Tesla is in a hurry to increase the automated production of Model 3, and as we understand it, requires even more manpower than Grohmann Engineering (acquired a year ago) was able to provide.