Is voltage gated K channel open during depolarization?

"Upon changes in transmembrane potential, these channels open and allow passive flow of K+ ions from the cell to restore the membrane potential."

Referencing the quote above, let me explain:

Notice 2 phrases: "changes in transmembrane potential" and then, "open and allow passive flow"

Potential is the physical term for the scientific term, Voltage, although, we are considering Micro-volts in this case, as significant Voltage with significant polarity as to cause the gate to open and allow depolarization by a passive micro-flow till the potential is sufficiently neutralized and then closes again till a sufficient cellular charge builds up enough to cause the gate to open once more. I say cellular charge because, transmembrane, indicates, from cell to cell.

Your answer is, "Yes". Polarization, indicates an electrical potential called, Voltage. The gate opens chemically and allows a passive flow till sufficient depolarization is achieved and chemistry closes the gate between cells again. Incidentally, a similar chemical process occurs to allow a grand depolarization process commonly called, "Lightening "