The interview referred to was conducted by Becky Quick on CNBC Squawk Box on Thursday, 2/23/17. The full interview is linked below.
Mnuchin did not say "the decision was good for the Treasury" during the interview with Betsy Qucik and there was no saying of the same by Mnuchin on the two Maria Maria Bartiromo video clips.
Source: Treasury Secretary Steve Mnuchin On Tax Reform, Growth, Border Tax, China (Full) | Squawk Box | CNBC