Once something has been compressed down to Youtube quality, noise NR and deblocking is often not possible. Mostly what happens is that the noise gets smeared out by blurring when attempting to filter it.
Some advanced Avisynth work is possible.
But I always hesitate to do that on Youtube source. Why? Because the person can often be contacted for the better source.
One these specific videos, I also don't find anything to be overly bad. A problem many people make is judging full-screen quality while sitting inches away at a computer. But once you watch on a TV, or at least sit back on the compute chair, obvious flaws because less obvious. Remember, video is to be watched/enjoyed, not nitpicked!
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