Most scientist praised the the rigor of the study. Some however have opposed the results arguing that there are other reasons to eat less meat related for example to climate change. It was never clear why red meat should’ve posed a risk to help to begin with. One can at least posit a rationale that processed foods can be harmful based on the chemicals used to make them, but there’s really no such argument to use against red meat. Fats were vilified for decades before the realization more recently that carbohydrates are the real culprits. The anti-meat bias may well be just a hangover from the fallacious discredited anti fat bias of the recent past. There are also some potential political overtones dealing with climate and animal rights. I any case, the main point, as stated by one of the study authors is:
The right choice for the majority of people, but not everyone, is to continue their meat consumption.