It's not going to take 15 minutes to understand WebPack and Parcel. Let's be a little more realistic. Sometimes you don't have the luxury of time and tools that you already know are going to get used, instead of new tools you don't.
If you have a use case as simple as the author is advocating, this only take about 15 minutes to grok. If it takes longer then you probably don't have enough front-end experience to productively contribute to this conversation. That is a little harsh, but the FUD in the JS world is incredible, mainly by people that have very little experience and understanding.