I'm not sure in this context if that is playing the piece 'wrong' or within the bounds of personal playing style?
The short answer is "depends on who you ask," as is so often the case.
Compare the beginning of these two performances of Chopin's Ballade No. 3. The first is Rubinstein, and the second is Paderewski, both Polish pianists (Rubinstein used to snicker at the "foreign accent" of most Chopin interpreters), and both considered great Chopin interpreters.
You will see that Paderewski is quite happy to roll chords (and yes, we call them "rolled chords" as well as "arpeggiated chords"), whenever he feels like it, even though they aren't notated as such (Rubinstein is playing the score as notated), where Rubinstein avoids doing this. (In fact, Rubinstein would often not roll chords that were annotated with an arpeggiation mark; he had huge hands and could block chords that most people couldn't. Showing off a bit, I'd say. :) To see for yourself, compare his performance of Brahms' first concerto, second movement, with that of others.)
This was part of the more wide-open style of the nineteenth and early twentieth century, and fell out of favor later on, as performance practice began to stress fidelity to the score over personal interpretation. More recently, things have moved back towards the middle--after all, if you stress the score too much, you'll lose track of your own inspiration and your performance will sound uninspired.
So, as you can see, Paderewski at least was most certainly in the "within the bounds of personal playing style" camp. For what it's worth, so am I.