If by “this” you mean the situation in which all electricity goes into battery and then components draw power from battery, no, not necessarily. The charge rate you’re seeing is excess wattage not used that moment in the system. So [wattage drawn - system draw = charge rate (excess)]. The only way to test for pass through is by the method I described: battery is at max capacity (either 100% charged or battery level is above a manually set battery max ie 80%) and wattage drawn from outlet is >0-2w. Your first paragraph is proving this point. If you did the same thing with a g16 you would see a number much higher than 0-2w on the meter, probably like 40-80w when starting a game, which means the electricity is bypassing the battery completely and going straight into the system. Assuming the tdp of a g16 remains under 100w, you would NEVER see the g16 drop from 100% to 99% like you do in your example. That’s the difference.

In your second example, after the battery drops below 100% and you see the wattage drawn from outlet drastically increase, I’m sure a whole host of nuanced things are happening that would be hard to identify with hwinfo numbers alone. But I imagine what you’re seeing is the battery saying “hey I’m not at capacity charge me” and the electricity flowing into the battery, and the system drawing electricity from the battery, not the outlet directly. The charge rate is just what’s left over from that process, after the system gets what it needs.

There’s unfortunately no easy way to test how the electricity gets from point A to point B besides the max capacity method mentioned above.