Its a clarification, not a redefinition. Exploration, as described in the PHB, "is the give-and-take of the players describing what they want their characters to do, and the Dungeon Master telling the players the result of what happened."I don't think it is particularly helpful for discussion to redefine terms that we should generally agree on (with some possible fuzzy edges). Calling an attack roll part of "exploration" (just to pick an example) muddies the discussion.
They even give an example of pulling a lever to see what it does, which just so happens to also be described as part of an interaction in combat.
Using the wrong definition of words is what fuzzies the discussion and the misuse of exploration is what prompted me to ask the question. Because I agree that Survival could use better rules from a simulationist point of view, but I disagree that Exploration needs any sort of complications within the rules.