That wasn't the engineers of GPT-4, it was Microsoft who have been fanning the hype pretty heavily to recoup their investment and push their own Bing integration and then opened their "study" with:
“We acknowledge that this approach is somewhat subjective and informal, and that it may not satisfy the rigorous standards of scientific evaluation.”
An actual AI researcher (Maarten Sap) regarding this statement:
The ‘Sparks of A.G.I.’ is an example of some of these big companies co-opting the research paper format into P.R. pitches. They literally acknowledge in their paper’s introduction that their approach is subjective and informal and may not satisfy the rigorous standards of scientific evaluation.