|Blaeringr Goblin Squad Member|
...(snipped for brevity's sake)...
According to that study they were using the heaviest armor they could find: "which is similar to the weight a modern soldier might carry in their backpack", and "they weigh [up to] 50kg"
Traditional full plate armor could weigh as little as 20 kg, but most usually between 20 and 25 kg. Rather than reference a newspaper, let's reference someone who specializes in facts about this stuff: http://www.metmuseum.org/toah/hd/aams/hd_aams.htm#weight_b
What they were testing in that study you referenced was late 17th century armor which was greatly thickened to increase resistance against bullets. So it is very much out of context for this discussion.