Looks like they've gone for self-hosted open source Cloud Foundry rather than a PaaS offering from a commercial vendor.
Also looks like they're intending to build out their own platform layer. We're scaling back that model after 5 years trying to make it work because (a) the market moves faster than an internal platform, (b) internal platform skills can't be bought in with contractors and (c) one size fits all platform choices inhibit creativity. Maybe it'll work at government scale, but they won't be able to solve the innovation stifling effect.