One of Fallout's biggest selling points is it's moddability, its settings are meant to be tweaked. If changing something as basic as the timescale breaks a major feature, it's a bug. And lowering the timescale should slow down the rates, not speed them up, so it's not exactly intuitive or obvious.
The issue is that he changed the timescale without bothering to also change the hardcoe needs rate. It isn't a bug, just a user error caused by incomplete understanding of the modding process.
Yes it is a bug, it's an error that shouldn't be happening. The hardcoe settings should be synced to the timescale. Changing the time scale is a very common thing with mods, and there's clearly something wrong if doing so completely breaks hardcoe mode. Reading about this one is just one more nail to hammer into the coffin for me. I liked the idea of hardcoe mode but I also like playing with a timescale of 15. So I guess I'll be waiting until the GOTY at least before I even think about buying this game. Just too many bugs, starting right from the installer. I can't even be bothered following the developments of this game anymore, it just seems like a colossal waste of time.
See above. It is not a bug, its an error resulting from his tampering without understanding the process and how the needs in hardcoe mode are calculated. You can change their rate but you must make it match your timescale or you will get wacky disproportionate results like he did. If it was tied directly to the timescale and immutable, you would not be able to mod the rate at which you become dehydrated or hungry.