"Reddit’s top lawyer, Ben Lee, said the company is considering legal action against researchers from the University of Zurich who ran what he called an “improper and highly unethical experiment” by surreptitiously deploying AI chatbots in a popular debate subreddit. The University of Zurich told 404 Media that the experiment results will not be published and said the university is investigating how the research was conducted."

In researcher speak this means that they went into their research with a definite bias thinking redditors would wipe the floor with the bots and the results are so damning it makes them all look really bad. They wouldn't be hiding the results if that were the case and I highly doubt reddit can take any action against them but then again I'm not a lawyer in the slightest.