Per their releases, core Nordstrom sales are 2x Nordstrom Rack sales
and growing faster, so it was probably a more nuanced point.
Nordstrom's overall Gross profit is basically equal to Nordstrom Rack revenue, so it's nearly impossible for the majority of profit to come from Rack, unless they get their inventory for free.
If I had to guess, this was during the days when Rack was just starting and growing like a weed (back when execs and management probably thought it would be the next TJX), so it was the focus and what everyone assumed would be the core in the future.
For a variety of reasons (particularly the recent resurgence of designer brands due to social media), that never played out.