Maybe it's just on my side but the l's in the flipped "all" seem to be either displayed upright or not at the correct height. Which would only support the linked article.
This is often the reason why character X is in Unicode but seemingly equally useful character Y isn't. At some point somebody put X in an encoding on some archaic hardware you've never seen, but not Y. In this sort of case neither X nor Y are things you should emit if you don't need them, but they're in Unicode in case somebody finds a pile of Huge Corp X42 tapes and wants to convert that to Unicode.
In cases where both X and Y, and even the more obscure Z are encoded, chances are Unicode has them all because humans (not just some obscure computer hardware from the dark ages) used X, Y and Z to write stuff, and another Unicode goal is to be able to encode all human writing systems. The over-abundance of combining forms you abused on your word "this" is almost all for that reason.
Turns out text rendering _really_ does hate you.