true, except for the part about A6, it wouldn't be able to handle this game at a decent fps. I've discovered these things when developing PreVa.
A6 can be fast if you know how to take it to it's limits without breaking it... Rarely anyone here really pushed A6 to it's visual limits, but Sebcrea was mostly doing just that.
I believe he did complain about performance issues at some point, hence why they switched engines I suppose, but don't forget this game originally ran on A6 (and good as the ingame footage showed back in the day, but that's 1-2 years ago.).
I think engine-wise he demanded a bit too much relying so much on shaders for everything. It looked great, but it comes to no surprise that he ran into fps issues there.
