This is access to the US government super-computer fleet as well as compute on AWS, google, IBM clouds and at MIT, and RPI. The press release says there is aggregate ~330 petaflops of compute on offer.
See https://insidehpc.com/2020/03/ibm-doe-launch-covid-19-high-performance-computing-consortium/ for the press release.
Better landing page: https://covid19-hpc.mybluemix.net/
For EU based researchers see COVID-19 HPC consortium (EU)