Generalization Bias in Large Language Model Summarization of Scientific Research

It took me a bit to understand this, but I think this is about the AI making conclusions that the research is not saying. For example:

Original (13): 'Among adults with obesity, bariatric surgery compared with no surgery was associated with a significantly lower incidence of obesity-associated cancer and cancer-related mortality'

DeepSeek (UI) 'The study concluded that bariatric surgery is associated with a significantly lower incidence of obesity-associated cancers and cancer-related mortality compared to nonsurgical care in adults with obesity'

Here deepseek changes it to become that the surgery is associated with lower cancers, while the research isn't making that claim and just presenting data.

I don't really see the issue, but please, explain to me.