The original op-ed actually addresses this. Sounds like the plan is to get SpaceX, Blue Origin, et al. involved.

To achieve these goals, the National Space Council will look beyond the halls of government for insight and expertise. In the coming weeks, President Trump and I will assemble a Users’ Advisory Group partly composed of leaders from America’s burgeoning commercial space industry. Business is leading the way on space technology, and we intend to draw from the bottomless well of innovation to solve the challenges ahead.

https://www.wsj.com/articles/america-will-return-to-the-moon...