It stopped being true after the Romney loss. They wrote a report [1] that basically outlined the fact that due to demographic trends and the makeup of Republican electorate, the RNC would have to start becoming a big tent, multicultural party in order to succeed in the future.

The decided exactly the opposite -- they elected Trump and decided to become a party based on white Christian grievance.

[1] https://en.wikipedia.org/wiki/Growth_%26_Opportunity_Project