As someone who has enjoyed the last 3 albums (gave all 3 of them 7/10) I can sorta see where Roine is coming from to some extent. There's an added djent influence/vibe on the last few albums that wasn't there earlier in their career. Whether it's there because the band wanted to take their sound there or because it's a pretty popular trend among newer prog metal bands is up for debate of course, but some of those songs made me go "Yeah they're kinda trying to be Periphery a bit here".
Well, I wouldn't call it "added" because it's always been in the mix of their music, right back to the demo. But it did become a more prominent part of their guitar style from The Mountain onwards, and even more so on Vector and Virus because of the style of those albums. Also, the tighter production and 8-string guitars probably add to that sound as well.
And I don't know how much it matters, but I know for a fact that the band doesn't chase what's popular or trendy. Even with djenty stylings being more prominent after their first two albums, that was more a feature of it being interesting to them and (as I said) having the production to do it convincingly.
I was reflecting again on our discussion about Roine's comments and also comments that other people have made about certain styles etc, and I think what's interesting is that I think all the Haken members have really broad tastes and interests in music. Not all the same as each other in terms of the things they really love, but they're all really open to essentially any style. And when one or more of them gets into a style, it naturally follows that the sound starts to seep into their music to varying degrees. When they're writing and arranging the songs, there will be particular segments or transitions that they just don't think work, but to my knowledge that's not been a case of "it's a style I don't like" but rather whether it works as part of that song or album.