Great stuff! Isn't 53m roughly 173ft, give or take a couple of feet? If so, seems quite short for a hyper, but I suppose stats aren't everything, as Goliath at WH is only 47m/153ft tall and that looks insane!
A B&M hyper would be an awesome fit, because it's always great to have another of these awesome rides in Europe if Mako is anything to go by! However, I find it interesting to see Walibi go with B&M over a company like Intamin or Mack, as Compagnie des Alpes seem to have a better working relationship with Intamin and Mack than they do B&M (or at least they do with Mack, anyway.) As far as I'm aware, B&M have only ever built OzIris at Parc Asterix for Compagnie des Alpes, and that was in 2012, whereas Mack, for example, built both Lost Gravity at Walibi Holland and Pulsar at Walibi Belgium in 2016 alone for Compagnie des Alpes. Very interesting that they didn't opt for a DC Rivals-esque Mack hyper, in my opinion.
However, I think Compagnie des Alpes made the right choice going with B&M, because they will get a smooth, thrilling, airtime-filled, reliable and high capacity attraction! What's not to like? Also, even though they pack a great punch with some decent moments of force, it seems to me like B&M's hypers appeal to a wider demographic than Intamin's and Mack's do because whereas Intamin and Mack hypers (or at least their recent ones in the case of Intamin, anyway) are very aggressive, ejector airtime-filled positive g-force machines, B&M hypers are quite gentle, unintimidating rides. Even though they do have some decent moments of force, I'm going to presume that the forces are nowhere near as relentless as those on an Intamin or Mack hyper. For example, my mum isn't into big, intense coasters at all, and she loved Mako, so much so that she declared it her number 1 coaster. I think that if Mako had been a ride like Skyrush or DC Rivals, then she would have absolutely hated it. I declared it my number 1 coaster too, even though I like big, intense coasters! The point I'm trying to get at here is that B&M hyper coasters hit a sweet spot in terms of thrill level; thrilling enough to satisfy coaster enthusiasts, but unintimidating enough for those who don't necessarily enjoy intense coasters to enjoy the ride. So maybe Walibi opted for a B&M so that they could get high satisfaction rates from a number of different demographics.
P.S. Sorry for the long post.