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First, not a rules question. Flagging to be moved.
Second, watching that video there are several things to note.
1) We do not see a comparison between how they do those same actions in and out of armor so we have no idea how much the armor is actually hindering them.
2) Several of those actions (such as the jumping up and kicking feet together) appear quite ungainly in armor.
Assuming that the person performing the maneuvers was proficient in the maneuver it appears to have been much more difficult in armor.
3) We have no idea how much people have practiced in that armor to do those things.
That could be akin to the fighter's class ability Armor Training, the trait Armor Expert, and/or having Masterwork armor.
Alternately, it could be akin to having many ranks in the skill.
4) We did not see them try to scale a wall without a ladder using either a rope or freeclimb (climb skill), walk a thin ledge (acrobatics skill), or swim in a lake/river (swim skill).
So, that video can neither support nor contradict a -6 penalty as it provides insufficient evidence but the person performing those maneuvers certainly did appear to be ungainly.