The cross discipline Engineering workflow is:
1. define metric of success
2. fiddle with system till metric is high enough.
3. <optional> research alternative 1.s and cheaper 2.s
Real software engineering, e.g. profiling optimization, is definitely a branch of engineering. Research into software architectures, is not.
Science is about disseminating the unknown. You do not do science in most software jobs. You are doing science if you publish your results in scientific journals. An example of real computer science is understanding how discrete systems (such as DNA or CPUs) can turn into complex systems (such as life or A life).
The author of this article has very little understanding of engineering or science.