So GPT-3 didn't replace your 2 ML engineers, OpenAI did.
GPT-3 didn't build itself.
GPT-3 is not doing what the ML engineers were doing (building models), GPT-3 is the end goal. The company just decided to outsource the work to OpenAI and pay a monthly fee to them instead of salaries to their ML engineers.
"We have already found several use cases for it, one of which replaces 2 ML engineers." -> Clearly makes it sounds like GPT-3 can do the job their ML engineers were doing.
I think everyone understood that.
One thing GPT-3 is not able to do for example, is replacing 2 ML engineers to build a GPT-3 like model. But OpenAI can do that.