Yeah I did. But It does work even if you make it the tiniest bit smaller than full-screen and I do actually play this way myself causes it's kinda needed on my trash potato computer.
Optifine has existed for years to do this exact thing without completely ruining your own gameplay experience This is such an odd video. Just........ Don't use shaders
On the client I use there is no optifine but I would rather have the client for all the features I respect your opinion but I even bothered turning of the shaders at the end of the video to show it was effected.