The CEO of Tomorrow Studio (The studio doing the live-action), Marty Adelstein said in 2017 that its budget "could set a new record for the highest production cost in television drama history". Ofc, since then more expensive shows have been announced but the figure would still be along the lines of what is being mentioned and if the CEO himself is saying this then I don't doubt it. And OP is the world's best selling manga and more than a $20 billion dollar media franchise. It really makes sense for them to invest so much.