Maybe @John Lewis can confirm but...
I believe the $340m is the pricetag for *everything*, including the football ops center, stadium, demolition of current structures, etc.
Even if this $6m is additional, I am pretty confident that the $340m does at least include the football ops center. So right off the bat the stadium itself is actually only ($340m - cost of the football ops center which is at least $25m given the TGH naming gift).