Will LCHF work long-term? Say, after four years?

Does LCHF work long-term? The answer is usually yes – assuming, of course, you really do eat accordingly long-term. Should you return to your previous food habits, you’ll also eventually return to your previous weight – just like with any other diet.
One man who’s kept to a very strict low-carbohydrate diet non-stop for four years is Tommy Runesson. Above is his amazing weight graph. It shows a steep decline of around 200 lbs for 1.5 years, and then a smoother stabilization period approaching normal weight. Today, his weight has been stable for around 2.5 years.
An LCHF diet won’t normally make you underweight, as long as you eat your fill. Instead, it helps most people (but not all) lose their excess weight.
Here is Tommy Runesson’s update after four years: 4 years and -200lbs (Google translated from Swedish)
Does LCHF work long-term for you?
Have you noticed that the low carb "experts" extoll the virtues of LCHF, put down everything else, but if someone is having a problem with it, they run away. They don't try to help. They take it as their ego has been attacked.
I went to see a Low Carb expert. After a few months, I still hadn't lost. When I asked his help in trying to figure out why, all he said was this works and I was cheating. I wasn't. He then got on me because I had 1T extra of cream when he only wanted me to have 3 T/day. Yea, like 1T of heavy cream was going to ruin my weight loss. So I cut back and still didn't lose.
I've even noticed on this site that the Diet Doctor was making a list of 17 things to do to lose weight. The last three would be for those who are having problems. Well, there are only three left in the series and it's been months since he's posted anything. Oh, except to put down anything outside his beliefs.
I've know people who have lost on LCHF. I've known people who have lost on Low fat, High Carb. I've known people who have lost on vegetarian. And you know what.....each has its own experts stating why their's is right and the rest are wrong.
I think we just have to find what works for us and ignore anyone who has written a book or runs a diet program. Why? Because if you prove them wrong, they lose a lot possible income. And let's face it, money talks. They like the money and will do anything to protect their theory.
I'm going to be attacked now by the LCHF cultists but that's okay.