Congress authorized that amount of spending. The actual spending happens when projects are obligated, often on a reimbursement basis - the Federal government reimburses the entity after they spend funds.
For example, here is MoDOT info on Missouri’s portion of the funding ($98.9M between FY22 and FY26.) The NEVI funds also require 20% local match - typical of federal transportation funding.
Federal funding is authorized, but has (mostly) not yet been spent.
https://www.modot.org/nevi
Spending $7.5B on 7 stations makes a neat headline. It’s just not accurate.