The article is identifying a tendency for
some people to over-explore (aquire knowledge) and under-exploit (apply knowledge). Specifically it's calling out when "exploration" is not being done in a structured way, and the result of that is slower / less effective skill acquisition.
If you want to learn to draw, you have a carve out time to practice and you need to learn a tree of sub-skills that may have interdependencies. Watching occasional youtube videos about drawing, or reading meta discussion about drawing is nice, but moves the needle very slowly. If your goal is a certain level of proficiency, you may not reach that level without a change in strategy.
I guess the author doesn't get all the way here, but by saying
"Stop thinking (reading, listening, watching etc.) about how to do something and just go do it."
...I think what they are getting at is this logical progression to pursue more exploitation (do stuff / apply knowledge), and to allow {the act of doing} to structure your priorities for exploration. I think a lot of folks talk about this (e.g. the whole idea of deep work).
It's a useful strategy because by _trying_ stuff, you discover what you don't know / what you need to learn, and as you conquer those things, you discover more things you don't know & this dynamic perpetuates itself.
This doesn't mean random exploration can't be helpful (as you point out, it can be very helpful) -- however by itself it has limited utility, and many fall into the trap of doing _only_ that. The idea of "productivity porn" is just "I'm stuck going wide when I know I should go deep," and the author attributes this to the firehose of feeds, tweets, blog posts, videos, etc.
There are clearly people who have the opposite tendency and go deep (exploit) instead of wide (explore), and can benefit from more explorative behaviors, but this blog post is not speaking to them. Maybe you're one of those people :)