Thats last few sentences make no sense. The argument is that uptake is stunted by the JVM's slow startup time, making it unsuitable for commandline utils or desktop apps. However thats easily fixed which was never more hillariously stated than when Rich Hickey did it a decade ago. A blogpost went viral and it was a thunderous critique of Clojure, focused on this single point of slow start up. In the comment section was only 1 reply from Rich:
time java -client -jar clojure.jar helloworld.clj
> system time 0.0001s
The -client param makes all the difference :)