This is essentially just a co-located box, that you connect to your virtual network over a VPN/interconnect. Why is it not inside the virtual network? Why is the pricing hidden behind a sales person? That seems like the first cloud instance to have hidden pricing...
They don't call it out in the announcement, but this was published in the same week as the "Supercomputing" conference - GCP hasn't had an answer for HPC workloads thus far, so maybe this is their attempt.