Cube spits out two new minions, the original was silenced. This is true for any other minion as well that gets summoned, like from Resurrect. Also, minions are NEVER summoned silenced, I don't think there is ever a situation where that could happen (currently); it must be from an outside effect.
To answer another one of your questions: No, silence is not removal. Does it remove the minion? No, it is not removal. It's more akin to a buff, albeit a negative buff in most cases.
I'll also leave you with a pointer. HOLD YOUR SILENCE FOR THE CUBE ITSELF. You are literally playing into their game plan by silencing the minion and not killing it. Only use the silence on the Voidlord if you plan on also killing it immediately.
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Nature is the Day. Man is the Sun. Woman is the Moon. The Stone is the Sky. The Art is the Way.