The original article was written about 20 years ago and he says that by 1999 lisp was already falling out of favor (if it had ever been in favor). So, 15 years ago (2008?) would've been almost a decade after that.
But to be fair to the TFA’s author, prior to about 2007 when we got our first CIO, we could literally use almost any technology as long as it wasn’t illegal and wouldn’t get NASA, JPL, or CalTech in trouble. I ran databases & web sites with public IPs, ran myPHPAdmin, phpNuke, QTSS hosts and bunch of other crazy stuff with public IPs.