There have been several studies that have shown eggs to be healthy. There are several studies that show they are unhealthy. Bias is a real problem in nutrition science.

There are zero interventional studies that show eggs to be unhealthy.

In other words no one has given eggs to one group, observed another group not eat eggs and shown that eggs CAUSE a negative health outcome.

Instead people have made statistical calculations on food questionnaires that are highly unreliable.

Also people have fed eggs to people and measured various blood levels and made a educated guess on what the long term effects could be.

If a study by Kelloggs shows eggs to be unhealthy how can it be trusted?

Likewise if members of the study are animal rights activist, vegans or some other ideology that could in one way or another effect their judgement that study shouldn't be trusted. Especially if it is not a interventional study. Of which there are none that show poor health outcomes.