High protein intake reduces lifespan =/
A protein restricted diet can increase lifespan. It should be common sense these days.
It has nothing to do with the incoming meat shortage. They can't afford to feed the current flock, so they are killing them off, right? So what happens a couple months from now? Prices are going to be insane for meat. They're trying to mitigate it.
A high protein intake (specifically: high meat) will only be harmful to lifespan if you're a lazy fuck.
If you do what the body adapted to do, which is strenuous work from time to time, a QUALITY protein-rich diet will do you some real good. Of course, most of animals we have today are fed a grain-rich diet, which is just as bad for them as it is for us. The meat we should consume is essentially grass-fed and thus rich in ALA, DHA, and/or EPA (Omega 3s). As you take great pains to limit unnecessary saturated fat and trans-fat intake, go out of your way to consume a variety of Essential Fatty Acids, and utility all these chemicals in the repair of damaged tissue (which comes about from rigorous activity), you'll be improving myriad "health variables" that improve your overall outlook. Lipid profiles, quality of circulation, muscle/fat ratio, CNS health and activity, etc. (these are simplified and very broad categories for the sake of argument here, I don't feel like finding a host of research sources).
Something I forgot to cover, as pointed to in the link provided by the poster above, Essential Amino Acids are another crucial aspect to keeping the body in healthy condition.
Like everything, a certain amount of moderation is necessary -- and there is no miracle diet (diet: your average nutritional intake - not a restriction-based weight-loss diet) that will produce a healthy body without any kind of physical effort. While some people can get away with minimal exercise and "eating whatever the hell I wanted", some of this is simply luck of the draw, and often they simply ended up eating a fairly decent mix more often than not.