The guy made it available under some FOSS licence, the company seems to have abided by that licence.
In fact they seem not to have. The licence is the Apache licence: https://www.apache.org/licenses/LICENSE-2.0
See in secont 4.c: "You must retain, in the Source form of any Derivative Works that You distribute, all copyright, patent, trademark, and attribution notices from the Source form of the Work, excluding those notices that do not pertain to any part of the Derivative Works" (my emphasis). As far as I can understand from the article they have not done so.