A World Rugby spokesperson said: "The USA coach's remark that women are being discriminated against is entirely false.
"The model that is operational at Women's RWC 2017 is the same one that is employed at elite men's competitions, including Under-20 Championship, Nations Cup, Tbilisi Cup, the Americas Pacific Challenge and others. It is also the format that was approved by all participating teams, including USA, long in advance.
"As Mr Steinberg knows, there will be a full review of Women's Rugby World Cup 2017 after the tournament has concluded and all views will be taken into account when considering how we continue to develop this tournament and build on recent success."
Sadleir was keen to talk about the importance of the review process that will take place after the tournament's conclusion, pointing out that a reassessment of the tournament structure, currently where the competition progresses directly from the pool stages to the semifinals, will be one area up for discussion.
"I know World Rugby are very diligent about asking for opinions back from both players, coaches and unions about how we can improve competitions and what are the lessons learnt.
"That sort of feeds into a new plan from World Rugby's perspective about what we are doing in terms of developing the woman's game.
"One of the areas we are looking at is what is the competition structure that is going to make the most of performance, going forward.
"All these things are going to go into consideration post World Cup, in how do we over the next eight years, over the period of this plan look to close this gap."
Black Ferns boss Glenn Moore says his side's game plan worked to perfection in their 48-5 demolition of Canada, securing a spot in the Women's Rugby World Cup semi-final.
Moore's side ran in eight tries to one in Dublin on Thursday (local time), successfully luring Canada's outside backs into the middle of the field through forward power plays.
In an eventful display, tighthead prop Aldora Itunu bagged a hat-trick and a yellow card, while Eloise Blackwell was also sin-binned.
Yet the side's 20-minute stint with 14 players mattered little as they stormed into the semifinals, where they will face the US.
They had earlier beaten Hong Kong 121-0 and Wales 44-12, ensuring they qualify from pool play with three bonus-point wins.
