I think it’s solid advice, you don’t want to tire yourself before the exam especially since you’re probably not going to sleep well tonight before or at least nobody does.
I took a different approach and actually took a test the day before, exit 24 hours before because I wanted to rehearse and stage my test day, I woke up at the same time I took the test at the same time award the same clothes I ate the same snack And then I repeated it on the test day.
Granted my day before the exam was a day off and so it wasn’t very busy I spent most of the day with friends keeping my time off the test only occasionally reviewing some of my checklists....
But if I had to work that day, then it would definitely be too much to cram into 24 hrs.