The only thing to watch out for....
I've said this about many of the "fad diets" (and while the carnivore diet people don't like it being called that, it's new enough that it hasn't graduated out of that category yet)... If someone's starting point is the S.A.D. (standard American diet), just about any of the fad diets are going to result in better numbers in terms of blood pressure and blood panels (as well as weight loss)
Doesn't matter if it's vegan, carnivore, paleo, pescetarian, keto, Mediterranean... you name it...
They're all cutting out a lot of the bad stuff that was in the S.A.D.
Since they're all diets of omission, they involve cutting out things that can have negative health effects, they'll all show some improvements in at least 2 or 3 of the key metrics doctors look at.
Meaning, if you're a person who's eating bacon cheeseburgers and fries, pizza, fast food chicken nuggets, and washing it down with Pepsi. Going on any one of those diets that makes you cut out a few of those things is going to be an improvement (at least in the short term)
The problem is, each of the fad diets has some "blind spots" and cognitive dissonance baked in (pun intended, lol)
In the case of the carnivore diet, I see that the in the form of cholesterol denialism, denial of the link between red meat and colorectal cancers, and the affinity for thinking that "grass fed instead of grain fed" is somehow the thing that makes all previous studies and metanalyses null and void, and for some reason, draws people into alternative medicine realms that have nothing to with a carnivore diet apart from the fact that they share the commonality of "both say to do the opposite of what mainstream doctors say"
(much like the vegan community will often have to find ways to claim their diet is the perfect human diet, while trying to rationalize the fact that they have to take B12 and iron supplements in order to stay on it long-term)
In short, if the carnivore diet is making you feel better, lose some weight, and improve a few metrics...great, but keep an eye on those LDL numbers, and if you plan on doing it long term, make sure you're getting screened for cancers of the digestive tract.
If you're into the "carnivore community", I'm sure you've heard of organizations like the Weston Price and Price-Pottinger foundation that encourages such diets. One of their evangelists (and also one of their VPs) by the name of David Getoff just died last year at age 70 of cancer.
When listening to his podcasts that were recorded in the last year of his life, it was sad. He was still trying to uphold his ideologies about his diet being the "perfect diet that historical indigenous tribes ate" and blamed his cancer on the fact that he had neglected his "liver detox regimen" (involving a bunch of nonsensical naturopathic supplements) over the previous 3 months leading up to the diagnosis. Basically, it came across as a guy who was trying to cling to his ideologies all the way to grave.