No, the reviewer did not write that reply. It’s a template copy paste response. Cmon can you imagine writing a detailed feedback assay for each authors item? That’s unrealistic. And this is a marketplace, not a school. Learn to do things properly and then enjoy your approvals. Until then ask for feedback here in the forums, or elsewhere.
As for what makes a hard reject. Bad fps… well if it’s literally lagging and chopping, not in a nice stylistic way, yeah that would be a reason. Else if its 25fps vs 30fps, that literally doesn’t matter. But if you set it to 13fps for no good reason and it will look bad… Yeah obviously you will get rejected. But if it’s a stop motion animation template, then yeah 13fps is reasonable for such an idea. It all depends on a wider context of what you’re doing, and understanding the boundaries of what is still acceptable as good in that context, based on collective knowledge and standards of this whole motion design / templates field.
Bad motion tracking as well, not enough product too, if that’s the only feature you’re leveraging to get approval with a mundane, nothing new idea. Bad rendering too if there are visible jarring artefacts. Bad file organizing too if the placeholders aren’t clearly labeled and are left somewhere amongst 200 random folders names.
But the the quality level understanding of your own project will come with experience, as you understand what good motion design looks like, and what is an artefact. Then you won’t have to guess if its this or that. And as for technical organizing stuff, you can always buy other authors projects and then look how they organize their stuff and mimic that. Once you master those two aspects things will get easier and clearer.
And then you will most probably get only rejected for either submitting the same ideas to already very saturated categories or for offering too little of the same stuff in a not yet so insanely saturated categories, where the only way to stand out would be too offer more value to customers which usually means more animations, more designs, more whatever else. Good luck!