To be fair, the headline says Qt, not QT.

Yes in all fairness, that is true, it does say that. One is made up of the letters q and t, while the other is made up of the letters q and t.

Human language is often case sensitive.

Ah humans. As humans does one thing not rouse in us the thought of another? Do we not draw connections between two things? Are these connections Never amusing? Has the smell of a soap reminded us of a summer spent at childhood friend’s house? Or similar? Or are all moments of joyful connection drawn to a halt at the hand of the parser? Forgotten to case sensitivity?

Happily I've seen both QuickTime and "Qt" abbreviated as "qt", "Qt", and "QT" because human languages are often ambiguous (in fact all written human languages can have ambiguity, but not all have capitalization, so arguably the former ambiguity is more prevalent and important than the latter)