The original comment was basically how "sure it is padded out but it is long so that makes this splintered game work! This makes it a full game."
What are you trying to criticize here? Are Fellowship of the Ring or The Matrix money scams because they have sequels? Were they not worth their full price when compared to standalone movies?
Was FFX only worth half the price because FFX-2 came to exist? Was FFXIII's 40-60 hours of content only worth 1/3 of a game's price because it's only 1/3 of the total story told?
You are
not paying a full game's price to play a 4-hour demo of FFVII's Midgar chapter in HD, which seems to be your perception here. No, you're paying for a 25-40 hour full game
based on the original game's first chapter. That does not means that the remake is, by itself, a short game with a short story, when it was entirely re-imagined, expanded and re-written.
Whether the new stuff is worth the price or not, whether it adds to the experience or is pure filler, that will speak more of the quality of the game and the quality of Square's game designers, than on it being "incomplete". But then the decision is no longer about whether you're paying full price for an incomplete game or not, but whether if you should do it for a game that may not be good enough for you.
But based on reviews, user impressions and the demo, all signs point out that FFVII: Remake is a better Final Fantasy game that the likes of XIII or XV, while being about or close to the same size content-wise.