The thing is, Starfleet did mine shut the wormhole, and did devastate Dominion dockyards on the Alpha side right thereafter - and still the Dominion beachhead force appeared to outproduce the combined Alpha forces! Dominion numerical superiority was a constant worry during the following years of war, even though we never heard of any Starfleet, Romulan or Klingon ship production or repair facilities getting destroyed or damaged...
It supposedly has canon information.
The thing about DITL is that it's color-coded: most of the stuff there is speculation, but whenever it's based on canon bits, those are indicated by their own color of friendly yellow. Green indicates something gleaned from backstage sources, while white and red mark pure speculation.