'you can’t beat exercise and a healthy, balanced diet.'
That is certainly true. People who do various forms of IF successfully do exactly that!
from your link:
'cutting your calories two days a week won’t compensate for eating badly the other five.' again true. Whoever said anything about eating badly 5 days a week?
The aim is to eat well on those 5 days!
Are you convinced that fasting does not force the body to break down muscle protein for energy??
Just click on Bigchoc's profile link!
I've lost fat and gained muscle during the time I've been doing 5:2. We're both over 50, so other things being equal we'd have been losing it. The plural of anecdote is not data - for that you can look at studies such as Varady's (I don't have a link to hand).
'Restricting calories' - by whatever means - is really the only way if you want to lose weight. If you are at your desired weight then you don't restrict your calories - but you can choose when to eat them.
The negative parts of that article iare largely people speculating about what 'might' happen - which turns out to be contrary to what people find in practice. IF is sustainable (unlike 'diets'). It absolutely is possible to do HIIT and heavy weights while fasted.
But as it also says: 'So is it possible to follow the diet if you stick to a healthy eating plan on the five normal days and are careful to balance your food choices during the fast? ‘Yes, if you choose the right version,’ says Sian Porter from the British Dietetic Association.'
If eating small amounts regularly works for you then that's great - stick with what works for you. And I'll stick with what works for me. 