The video you link is about that second scenario: intermittent high availability of renewable resources that can't be used, which is fine for the very same reason that when you're putting solar panels on your own roof you design for what you think it'll net on average, or even what you want to get out of it in fall winter and spring, not for peak power at noon on a cloudless summer day, which would be irrelevant and to call that "oversizing" would be something of a misnomer, it's well thought out dimensioning and hooray for curtailment!
The original article is about just being able to move any amount of energy whatsoever to where it is needed. If you don't improve distribution then you hit the saturation point much faster and more often than in an intermittent peak power scenario. Seeing that the original article links to multiple pages by the energy regulator/distributor about this very issue should maybe give us a hint that they, the actual experts, do think this is important enough to merit attention?
I upvoted your original post when you said that "it is hard for people to have constructive conversations about" negative prices and curtailing, but I'm starting to wonder whether you may be the common factor in some of those unconstructive conversations you've had in the past :-) Respectfully, it's not helpful to contribute to the discussion with a robotic pattern matched "curtailment is great actually!" whenever the topic is mentioned, without engaging with the arguments that are put forth.