From the linked article:

"2. Red meat causes heart disease, diabetes, cancer... and spontaneous combustion

The section of the report dedicated to protein blames red meat for heart disease, stroke, type 2 diabetes, obesity, cancer, and early death. It contains 16 references, and every single one is an epidemiological study. The World Health Organization report tying red meat to colon cancer was also mentioned, and that report is almost entirely based on epidemiology as well. [Read my full analysis of the WHO report here.] The truth is that there is no human clinical trial evidence tying red meat to any health problem. I certainly haven’t found any — and if there were, I think this Commission surely would have mentioned it."

Are we supposed to take this seriously?

Thanks. I would tweak that diet slightly. Drop the whole grains by an order of magnitude, up the vegetables as much as possible, and increase the lard/tallow to make up the rest. I do agree that we probably eat more meat that we should, but it does look like they are swinging the other way here. How much is 15 calories of beef? About a spooful?