This is an extremely unhealthy rate of weight loss. All guidance centers around .5-1kg/week as both safe and sustainable.

Not if you start from an extremely obese starting point like I did. I don’t recommend this rate to people with normal weight.

This is also wrong. It’s extremely unhealthy, unsafe and unsustainable to lose 15% of your body weight in 2 months.

Not wrong in my personal case - I've lost those 20+ kilograms with no problem to report.

Again, it was not a calorie restriction diet - it was a carb restriction diet.

Yes. But a real keto diet, where you are in ketosis, is impossible for most fat people to follow. They will inevitably cheat (“tee hee hee! It doesn’t count if it’s birthday cake! I’m so naughty”) and be in ketosis.

I’m fat, I’ve been cooking my own keto meals for more than two months, I’ve consistently been in ketosis and yesterday was my 50th birthday :)