Of course they talk about budgets in the “making of” documentaries, go back to what I said “Production costs and box office really only matter to those that make the films”. So of course the people making the movie are going to talk about the budget. What you quoted was me talking about the audience, audiences 15-20 years ago didn’t think twice about a budget, most didn’t even know what the budget was for a film, heck most still don’t today.
Also difference is those films you’re talking about were mostly small budget films to begin with. So costs are tightly controlled to begin with. For example you mention Rocky, that was a movie done for under $1M, again under $1M. No movie is being made today for that, not even indie movies. Coming back to Rocky that was a passion project that Sly did himself.
Anyways back to this movie, before we start throwing around numbers why don’t we wait to see what the actual reported budget is, they may find a way to keep costs down with this one.