I haven't seen that article, but based solely on the comments you folks have made and the fact that 99.9% of the articles of this type are crap, I feel I can make an equally factual statement here without hesitation.
I wrote a program in Python. It was fast. Python rocks. You should use Python for everything.
Again, I haven't read the article, but it sounds like another one of those... "Although nobody would every use a screw driver or a pair of pliers to hammer in a nail, I wanted to use the tools in a similar manner so I could compare them. So I pounded a bunch of nails into sand using a Craftsman #2 Philips Screwdriver, a pair of Channel Locks from Husky, and an old hammer my grandpa gave me. All three tools worked well but it is obvious that the hammer still out performs the screwdriver and channel locks despite their more recent heritage and the use of higher grade materials."
Look folks, programming languages are tools. Always use the right tool for the job; keeping in mind familiarity with fewer tools will generally mean greater proficiency with those tools and hence one's speed at building with those tools and often minimizing the development, and maintenance, time is a major requirement of a software project. YMMV.