The truth is that this sort of tightly controlled study -- participants were given 100% of their food as packed meals, were constantly monitored, met with a dietician constantly and so on -- is extraordinarily rare, and you'll never find them with large numbers of participants for obvious financial and logistical reasons.
And just to be clear, I have long been a strong skeptic of keto (there is a religiosity of that movement, and the science often doesn't keep up with the claims), so I didn't post this as a cherry picked adherent spreading a gospel, and instead it was truly interesting to me: I happened to get the correlating video while doing a morning elliptical routine and found it fascinating. What amazed me the most about this study is that the caloric restriction meant that even though the "keto" diet was high in fats and saturated fats, LDL and ApoB dropped among members of that group, well into the ideal range. I mean, it dropped across all the groups as a benefit of losing weight, but I think intuitively we would assume that group would see bad results.