Menno is hilarious and loves to take stupid abstracts and crap research to support his confirmation bias on the topic. I'm airly sure I know what abstract he's citing and it's by magician Jacob Wilson who's results are completely at odds with any version of reality.
On every level, hormonal and otherwise, it's not optimal.
Ketosis is a catabolic state even in high calories. Insulin down, SHBG up, T3 down, hyou name it and it's not optimal and that nonsense is popular online doesn't change anything. Lots of stupid stuff is popular online.