I am unable to find the study the fifth source references but I am willing to give it to you. The specific claim is “Roughly 28 percent of Czechs say they were better off under the communist regime … Only 23 percent said they had a better life now.”. The screams that the study merely has very little significance and thus should be avoided like the plague. Instead, someone decided to write an article about it…
The sixth source references a poll done by Center for Social Democratic Studies and included 1813 respondents. Given they are relying on respondents this study is going to have a high sampling error so it can’t trusted. Having said this, even if you could trust it, the study pertains to life being under specifically under Josip Tito which is not equivalent to perceived preference towards Socialism.
In that same section a Reuters report is sourced and relies on the same pew research study as the fourth source. Unlike the fourth source, unfortunately the report completely miss-characterizes the data with massive generalizations that are not explicit in referenced study.
The seventh source relies on 11 other sources all of which but one lead to either dead links or other articles that have no sources. The only notable reference is the eleventh source from the Center for Research on Globalization and is titled “The Tragic Failure of “Post-Communism””. This research group is literally a meme:
RationalWiki, Media Fact Check, Quora Post
Some of there work courtesy of the Qoura post:
"Depopulation Vaccine" in kenya and beyond
Flouride: Killing Us Softly
North Korea, a Land of human Achievement, Love and Joy
(I swear I'm not throwing shade with DPRK one.
After doing a barely any digging I found that the article you posted is actually just a copy of this reddit post from 2014 which references all of the same sources. A minute later I found this politicsforum post from 2012 with again all of the same sources.
Essentially, the only thing original in the entire article is the massive straw-man at the beginning.
Lastly, I want to touch upon the video...
This individual literally talks about cognitive dissonance of anti-marxist for 8 minutes while basing this on an article he states collects polls while in reality they link you to 5+ old articles that reference older polls, the majority of which do not support his claim in any way substantial way as I've shown above.
This is the essence of Irony of Exception