As has been said before, PLED is just a commercial term to rebrand plasma, which seems LG Spain is trying to use to avoid plasma bad press. As said, LG applied for PLED as a trademark. Model is PM9700, hence P for plasma. Every plasma in the world can be considered a "pixel light emitting display." As for 600MHz "speed", Panasonic introduced 600MHz subfield drive, as every other plasma maker. The press note is just pointing the classic advantages of plasma technology over LCD.
As for consumption, the 6% *increase* above LED (that's what original Spanish text says), well, it may be the case under special optimal conditions, we all know plasma consumption is variable. Maybe LG achieved to lower consumption, but most press text I see just says consumption is lower to plasmas, which can be true as newer gen plasma usually has somehow reduced consumption. Other LG Spanish press notes specify "PLED" PM9700 consumption is 130W for 50" and 183W for 60" and claim that to be "40% lower to plasmas." Well, all this can be true if you chose specific other models.
So, it's all just creative advertising.