The linked article states 100 Gb/s, i.e. gigabits per second. But the post title says "100GB/s" which suggests gigabytes per second. Worth correcting, because getting 100GB/s between two machines in the same rack would be quite an achievement today.
And also, this being a tech oriented start up targeted discussion site, it would be important to get the basic units of internet service correct in the titles.
I think in this case the issue isn't binary prefixes vs decimal which in this case would amount to a ~7% error, but rather bits vs bytes which is an error of ~800%
As others have pointed out it's the difference between bits and bytes. But "among bytes" units, I prefer the base-2 SI units (KiB/MiB/GiB) because as written, they're unambiguous.