You can toss these surveys out the door. It is a list of what SEOs think are ranking factors. I did not look at the list. I did not have to. It is not uncommon that silly [****] appears on this list. Keep in mind that most online SEOs are not technical people. They are not coders, DBAs, systems internals engineers, systems analysts, etc. Most, are marketing people or IT people with little background knowledge, and yet, these folks pontificate about how search engine internals work. These lists get created and good kind folks like you think it is gospel. It is not.
Since the very beginning of Google when it was just a research project way back in the dark ages before the first dawn, the birth of man, Christ, and the cell phone, way back in 1997, there was no restriction on the size of the web page. For some processes, there was a limitation, however, the entire HTML code as fetched and then indexed. In all of the patents, research papers, and books written by the engineers, I have yet to see any discussion about the size of the HTML. In fact, here is a quote from the original research paper:
The repository contains the full HTML of every web page.
Google does not care one whit about the page size. Where this fallacy began was when some wise acker found that there was a limitation in the hit list. This was related to the starting character position in bytes of any term matched being limited to 4095 (of 4096). This was reflected in the SERPs, of course, and the wise SEO jumped to the conclusion that Google only looked at the first 4095/6 characters of any given web page. This is clearly not true. The original reason why the hit list was limited was that disk space was expensive and the return on value of indexing terms beyond that point became moot and did not improve the ability of the research search engine to prove it's point. That was a limitation that was removed quickly especially as Google moved toward becoming more of a semantics based search engine back in 2002/3. That was just before the invention of the wheel mind you. Since then, more wise ackers have come along with their own theories forgetting that Google does tell us what they are up to in a fair amount of detail most of the time if you chose to read and stay off the SEO websites.
What you have to do is separate out fact from fiction. And YES(!) I do realize that is why you are here.
I found one important question to ask yourself is the same one Google asks at every juncture (admittedly they do get this wrong sometimes). Are the metrics I am seeing a true indication of quality? In this case, No. The notion of limited HTML size is not an indication of anything at all except the HTML size. Therefore, and I can say this with surety, HTML size is not a ranking factor and never was. However, size of content, provided that it is too short, can lead to the assumption that the content is thin.