You said the information was incorrect, but it isn't incorrect, and you've been moving the goalposts ever since.

Every rectangular flag has a specific aspect ratio and it's incorrect to make it wider or narrower than that. The Swiss flag isn't special just because that ratio is 1:1.

"So many sites" also gets most (or all) of the other flags wrong, because they pretty much always just fit the pattern on one size of rectangle. Which isn't any more correct.

>A square is a rectangle but ask the general public

I went to a church that called a "rectangle" a "square". It drove me nuts.

For context, after the first round of singing, someone would announce "kids go to children lessons, light up by the door with the green square (it was a rectangle)". They did this every service.