The 5300 to 1 is, as you said, not correct.
It is actually, according to the authoritative source, 5,375 to 1. I rounded downward instead of upwards as one would normally do.
It's a quote from Fletcher Previn, IBM VP of Workplace-as-a-Service and the man in charge of deploying the new machines, who stated it when IBM had 130,000 Apple devices deployed. I stand by it. You can pound the table all you like but it is factual. It was cited in "The Apple guys at IBM are smiling. Here's why." by by Philip Elmer-DeWitt -- Fortune Magazine -- October 16, 2015.
Previn also stated in his speech that:
He went on to say "Every Mac that we buy is making and saving IBM money."
As to the 70 Windows users to one Windows IT tech support guy. . . some businesses are actually running with 20-25 to one. Sad, but true.
Again, not in the real world
Just in Apple fanboi world
And they are using the term “devices” not desktops as well
5400 iPhones and iPads with simple Apps is different to support then 5400 OSX desktops with more complicated software
You are comparing apples to dump trucks at that point.