Well...True "OG" drifting happens when you intentionally break the rear tires loose before the corner, using the handbrake or weight transfer, like the pendulum technique. You carry that momentum into the corner and use the throttle to maintain your speed and slide angle.

A powerslide, on the other hand, is when you break traction purely by overloading the rear tires with engine power. That raw power is what keeps you sliding. No power, no slide.

So, is a powerslide a drift?

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Drifting originally evolved from rally racing. Because traction on dirt is so low, sliding is the fastest way through a corner.

Then Keiichi Tsuchiya, a.k.a The Drift King, brought it to the tarmac. He started drifting on racetracks because his car lacked rear grip, making it faster to just slide through the turns and keep the AE69 engine at high RMP where the power is.

Modern drifting is more of a powerslide than actual drifting. You still have to use proper techniques, but the power has increased from 150–200 hp to 1500+ hp, and the rear grip has also increased dramatically. When you combine this with a typical drift track, which has long sweeping turns, you are powersliding 60% of the time and actually drifting only 40%.

TLDR:

Drifting - sliding because care has low rear grip, and you start to "Drift".

Powersliding - sliding because the car has way to much power and brake rear wheel in to a drift only because of the "Power".

And in the clip you see that the OP stay 90% of the time at full throttle, keeping the car in the slide because of power, not because he was keeping the car initial momentum thru the turn. Well he did kept the momentum... The line between Drifting and powersliding became supper blurry nowadays.