An Amiga 500 is barely faster and has not much more memory than a PC-Jr, but we don't "parody" the 500 like this article appears to parody the Jr. The 500 could connect to an ISP over a 56k modem and even had a reasonable browser.
Regardless, I'm not sure where you picked up a sense of "parody" from the original article. I see an almost touching devotion to make something useful out of a dead, useless platform. It's ridiculous, silly, and probably a waste of time, but it made me smile anyway, and brought back memories of all the time I spend playing with my own PCjr in my parents' basement 20 years ago.
But if this had been a C64 (I had a C64 once and never had a PC Jr) I guess I would have been kinder. ;-)
Amiga: July 1985
Four years, eh? :)