I don't think that is supposed to be the first paragraph. It's that thing whose name escapes me that goes under the title that gives a summary or teaser for the article.
I too was confused by it, because they did not format it different or set it off or do anything to indicate that it was not the first paragraph.
Aside from the formatting, the article does seem reasonably OK content-wise, although all five foods are recommended for the same reason: they are foods that are highly satisfying without having a ton of calories, so by eating them you will naturally tend to eat fewer calories.
I'd add a caveat that for this to work, you do need to be deciding when and how much to eat based on how hungry you are, not just out of habit. I can eat a whole pizza regardless of how hungry I am because they are so damned delicious.
I kind of accidentally stumbled onto the "eat foods that are more satisfying to lose weight thing" a little over six months ago. My HA1C numbers had crept up over the last couple of years from below 6 to 8.9, and then down to 8.1 after I made an effort to eat less sugary foods, but I needed them back down to 6 or below.
So I added carbohydrates to my meal tracking spreadsheet, and started aiming for 40% or less of daily calories from carbs. That, of course, meant I raised the percent of calories coming from protein and fat, which meant I was eating more satisfying foods. (My averages for the year are about 35% from carbs, 20% from protein, 45% from fat).
I was not trying to cut total calories...but I ended up cutting my daily calories in half because I was now not as hungry and that's just how much I ended up feeling like eating. I've now lost 80 pounds, and am still losing at a decent rate, and my HA1C is down to 5.5.