Ok.. I took the time.. and have taken a look at this video.. it is a total fake joke.. First of.. guy shows his watch before timelapse.. no snow on the mountain.. timelapse starts there is snow on the mountain
Those are different video segments shot at different times.
, second, sun at 2:12 is covered by something I think should not cover the entire sun size..
Not sure what video you are looking at, but I assume you mean something like:

That's just how big the actual sun is on a wide angle shot. Most of what you see on other frames of the video is flare.
2:15.. sun is suppose to shine through a street lamp.. yet it looks like nothing is coming through the glass.. lamp should be very illuminated by the sun..

It's mostly obscured by the lamp holder.
and sugar in the end...
clouds at the end of timelapse are identical to clouds at the begining of timelapse...
That's correct, this is the same at the start and the end of the loop.
What this means is he created a seamless 360° loop, probably by blending two or more consecutive days. The "start" is actually the middle of one of those segments.
So it's not a raw 24 hour segment. But it still shows the sun coming from all directions, so it's essentially the same things.
Edit: Actually looking at it again, I think it's more likely one segment, like 26 hours, and he's just blended the loop join with the extra material, probably at around 1:15.