The general mood seems quite negative on that post.
I'm a pro Nextflow person, but what's said in the summarize is mostly true. Maybe trivial but might be useful for a beginner that has to choose between learning Snakemake and Nextflow.
Companies has to find ways to exists, so I guess this post is an acceptable way to do it.
And it is not as one-sided as it looks, there is even a pro-Nextflo paragraph: What Nextflow is good at