Unfortunately I can not watch that video due to the GEMA, since I'm in Germany. :/ I clicked through some random other videos, but didn't find any one where this occurs. If you know some other YouTube videos where this happens, please let me know.
I figured out what's happening, when I watch some YouTube videos embedded in websites, the "Ads by Google" is gonna be there for sure. But if I watch the same YouTube video directly on youtube.com the ad isn't gonna be there.
I just updated my filters and tried a few embedded videos, even if the little yellow mark is still in the load bar like when the ad is about to appear, it's not, seems like you fixed it.