* As for saving on the cost of commuting, it likely isn't true.*

It likely is. And it seems like the author is really just reaching for something else to talk about.

There's no guarantee that employees will save on commuting costs. In many cases, employees will travel even farther because they'll use the extra day for vacations they wouldn't have taken or run errands that they would otherwise do while at work.

The whole point of saving on commute costs is so you can spend that time and money doing something less stressful and mind-numbing, like taking a vacation. So yes, if you only commute 4 times a week instead of 5 you're saving on commute costs, period.