I spent my entire youth listening to friends saying that Sonic couldn't run on anything else, due to it running on Blast Processing.
You must understand how I feel now, knowing that it was bullshit. Allow me this little moment of retroactive smugness.
We've already been through this all in the other locked thread. This demo was also linked as video.
This tech demo is a fantastic technical achievement, especially considering it was all created by one person (to the best of my knowledge). I think it deserves a ton of praise and I love seeing things like this from a technologist perspective.
Having said that, this is a tech demo with only a single level. The physics are not exact as even the DF video mentions, the demo runs at a lower resolution due to SNES technical limitations. The scrolling speed has horizontal stuttering that is especially noticeable when they show the side by side screens moving at at a fast speed. There is also noticeable frame drops and slow down etc.. There is no boss and this level is the slowest of the Greenhill zones with the fewest loops etc so giving the smallest chances for fast acceleration etc... There is a reason this level was chosen to demo.
Similarly, Sonic The Hedgehog is also the slowest of the trilogy with Sonic 2 being significantly faster and adding the spin dash.
So, my answer is the same as the other thread. Could Sonic run on the SNES as is? With the same physics, numbers of enemies, effects, speed, resolution etc..? No. Could the SNES run some kind of approximation with various short comings and changes? Sure, it likely could, but then that wouldn't be the same thing.
This is a fun tech demo to discuss if we can leave 30 year old fanboy wars out of it for consoles that are long dead. Love seeing things like this and it must have been a huge effort from an incredibly talented guy.