No. That's not a subordinate subclause. First of all "subordinate subclause" makes no sense because we don't have enough here to get all the way to "subclause". Maybe you meant "subordinate clause." But even that is nonsense because there is no subordination here. Those are two independent clauses. Whether they are closely related enough to be connected by a comma is a matter of style. I think this is a weak usage, especially when the all caps aspect is taken into account.
Personally I found the article to reflect my own feelings on the topic. Perl, for all that it is an amazing language, simply has more overhead than necessary--especially compared alonside something like Ruby. While it may be more due to improvements in my coding skills, I find my Ruby code is much easier to debug and maintain than my Perl code. That's important. While they are both easy to get up and running, debugging and maintaining code are the lion's share of the work many coders will be doing.