Well, then we are talking about different things.
Tata hasn't changed the playing style or philosophy of Barca. He tried to add some tactical variations in how we attack and how we defend. Finishing moves quicker, more diagonals, more emphasis on wingplay, deeper defensive line to prevent 1 on 1 counters and also have space upfront when we break ourselves, Messi less involved in the buildup. More freedom in general. You still recognize this team as "Barca", albeit slower and worse than it should be because some of the tactical tweaks didn't come off, some players have declined and many opponents have adapted to this current Barca squad. The basics are still the same though. You still have a team with 68 % avg. possession and > 600 short passes per game. Centerbacks splitting, positional rotations, ball retention. Everything is just ... worse or slower.
Basically if I showed a non football fan footage from 10/11 and this season's Barca and another footage "from any other top team" he would easily recognize 10/11 Barca and the current Barca playing the same style. If you get what I mean.
Its still possession football but the difference is Tata's team played down the wings while Barca teams before played down the middle.