I hadn't heard any such comments about a stance change. And, of course, I tuned in to the game today right AFTER his first at-bat and my reception was HORRIBLE during the second at-bat. He's much, much lower...not just wider. In the 30th vid, he is way down in a crouch with an open stance - he was good at hitting pitches away and swung at them as a result (before the change) so he was prone to sucker-pitches, especially from righty change-up and lefty-slider pitchers. an open stance would force him to stay off of those away pitches and the low stance would forcibly reduce his bat through-speed (dial back his aggression...even though he's a slap hitter, he swings very hard for that player type from what I've seen...possibly helping to explain the high K rate) and get him to focus on a smooth, level swing.
That is what I see in those snapshots anyway.
That wouldn't do much to his power numbers because he gets most of his doubles on fliners and bloops anyway, but would probably lower his K rate. If he can get the K rate down from 24% to 16%, we have a very different upside opening up.