It's true that the OP page skips a lot of characters (including all the Han Chinese characters -- it occurs to me that I have no idea if Unicode says anything about how these characters should be sorted).
But the page you're linking is different, it's just iterating over all codepoints in order by their codepoint number.
Developers take note: Unicode Collation Algorithm (UCA)…
As discussed on https://forum.glyphsapp.com/t/unicode-collation-to-alphabeti...