@L.Dutch hasn't explained anything to me and I don't claim to read @L.Dutch's mind.
But I do know the deleted answer wasn't a valid frame challenge.
From A proposal for helping users understand frame challenges we read,
Formally: I propose that frame challenges are an acceptable way to answer any question posted to this site. As a definition: a frame challenge is any assertion that challenges the premise or underpinnings of a question.
I propose that an acceptable frame challenge must fundamentally express the idea:
What you're asking for won't work because of X, but you could alternatively consider Y
I'm not looking to impose a specific form (syntax, format, etc.) as much as I'm proposing a philosophy. (A) A frame challenge must of necessity contain an explanation of why the respondent believes answering the question as proposed by the OP isn't useful, relevant, or meaningful. However, (B) A frame challenge need not offer an alternative solution.
In your deleted answer you never challenge the frame. You identify no issue that you consider wrong with the premise of the question.
In fact, at best, what you propose (cool as it is... and it is cool...) is really nothing more than an aspect of the requested graph. At worst it falls into the same category as the comment made by @Vesper and my response to it:
The real question here is, what are the means of the ship to dump excess energy while travelling through the nebula. At the very least you're looking at a constant heat flow from the front of the ship, together with it getting damaged by individual particles, and the former would melt the ship way faster than the latter. – Vesper
@Vesper That's a method of extending the maximum velocity of the ship, but it's not a requirement for the graph. I've no doubt there are a great many things that could be done to extend max-v. I doubt the quesiton could reasonably account for them all. This is meant to be a starting point to help worldbuilders understand the consequences of increased particle density - not to help design a ship to get through any arbitrary particle density. – JBH
The "frame challenge" doesn't challenge any premise and, though not obligatory, offers no alternative to achieve the goal of the quesiton — which is a graph helping worldbuilders understand the consequences of nebula particle density on space ships. All it does is point out a cool way to increase maximum velocity.
Were Stack Exchange a discussion forum, or arbitrary brainstorming questions permitted, then the deleted answer would have been an amazing answer — to another, similar question.
Consequently, I must support @L.Dutch's decision to delete the answer.