He IS saying that. Vi is more efficient for him every hour every day because he has been able to learn it to the point where there is nearly zero effort in using it. To learn something else would be to throw away all that hardcoded memory and try to rebuild it.
Learning how to use a proper IDE is a change in workflow.
I never made that switch. The muscle memory of 2 decades of using a software is under appreciated.
For me, it is about preference for what to optimize for.