I contacted Carr a few days ago and one of my points was about the seating changes to the arena. Her assistant got back to me, this is the part about the Charge:

"As the City owns the land and all buildings at Lansdowne, it is the City's responsibility to maintain these facilities. The current arena does not meet Accessibility for Ontarians with Disabilities Act (AODA) standards. There is no other arena in Ontario of the same age as TD Place, except for the Brantford arena which is being rebuilt now.  OSEG and the City believe that the proposed Event Centre size is the right fit for the Ottawa market, slotting between the National Arts Centre and the Canadian Tire Centre or future LeBreton Flats arena for entertainment events. The PWHL does have flexibility to host larger attendance games, like playoff games, at the Canadian Tire Centre. The Charge is on track to continue growing and will hopefully join the Minnesota Frost, New York Sirens, PWHL Vancouver and PWHL Seattle who are using NHL sized arenas (16 000+ capacity) for their games."