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I am not a rocket scientist, but this looks like the hot swap never happened. Lower power on a pump, then it completely drained battery and just stopped, engine is off, end of story.

It's a bit disappointing right because this hot-swap-and-then-ditch the battery maneuver is their key know-how, it helps to keep 2S engine simpler and cheaper.

If the engines were shut down, the acceleration would be instantly negative. The decay happens faster, no shutdown until it hits zero.

For negative acceleration the body needs a force applied in opposite direction. Atmosphere density @ 190 km is nine orders of magnitude less than at sea level, so the drag is negligible.

Gravity is the negative acceleration force.

Gravity vector was at the moment directed about 70-75 degrees relativе to speed. You may see the speed decreasing slightly while altitude still increasing, meaning vehicle gone ballistic.

Great Scott! Love his KSP content, where he discusses space trivia to no end...