It would seem that B&M can sometimes experiment with new concepts and then return back to their old ways at times, so I wouldn’t be surprised if they are perhaps making the vest restraints less prevalent again. There’s certainly a precedent for it; for example, all of their hyper coasters built between 2008 and 2012 had staggered seating, and then all of the ones built since (the gigas, Mako, Candymonium, Music Roller Coaster) have all returned to the traditional train design.
However, this could also just be down to park preference. Other B&M models are still very much utilising the vest restraints; for example, Emperor, SeaWorld San Diego’s brand new dive coaster, is utilising vest restraints.