The article is talking about the possible "upload" bandwidth because a full node may also send its blockchain to its peers that are in IBD.
Which also means more data are required, especially if your node is active.
Although, I was referring to what I quoted. It was a typo from me. I meant 20 gigabyte monthly of download, and not 200 gigabyte.
Download usage is around 20 gigabytes a month, plus around an additional 340 gigabytes the first time you start your node.