The maga concept of paleo (not restricted to maga of course) is that "cavemen" (and by extension themselves) ate almost entirely meat or dairy (like cheese). A day or two ago I read that there is a current of scientific thinking on the topic that figures that our recent and distant ancestors ate mostly vegetarian and meat was not rare but not common either. Ironic.
But yes, paleo is a fad diet and harmful even if only because it is extreme and not diverse. Part of the reason for diversity is diversity of absorptive processes in the digestive system, so diverse intake promotes nutrient absorption. But as we all know, maga hates diversity with a passion.
This does not even get into questions of arteriosclerosis and inflammation on the brain (ischemic events and mini-strokes), heart, kidneys, and other vital organs.
Paleo wannabe cavepeople surely fall in the all-amino-acids group and not the reduced isoleucine group. In fact they would probably be in an elevated isoleucine group, with concommitant deleterious effects.