The term is correctly used in this context.
is it? is it really? It means, "of or having to do with pirates". You said:
Piratical alternative to Windows Media Player.
Which means that it's an alternative to windows media player that has to do with pirates. But it has been shown, explicitly by you, even, that VLC is not pirated.
So the question is, if you used it properly... where is this association with pirates or pirating?
Clearly it was a mis-dictation by your speech to text software.
Yes. For pirates VLC is practical
That doesn't make it piratical. You are, again, obviously trying to cover up a misdictation by your speech software. Stop it. Everybody knows that a computer cannot perform that task perfectly yet, but to turn around and go "oh, it was totally on purpose, I'm so smart and can use words you guys don't understand, using definitions for said words that don't exist"> I mean, come on.
VLC is used by Graboid.
Yes, that spelling is correct...
... and it means...
...just what you would expect.
graboid isn't a word. I have seriously no idea what you are trying to do here.