The average community size is approximately 500,000 (its actually more but lets use that as an estimate). And lets use actual statistics rather than tiny polls:
https://www.reddit.com/r/ffxiv/comme...tone_data_715/ (It's outdated, but a good enough estimate for this post).
If we use that as a base then we can extrapolate that 100 / 500,000 = 0.0002, which is 0.02% of the community. That poll is based on a minuscule fraction of the community and is nowhere near representative.
Lets even put in some more assumptions to dispute the data. Let's assume that every character in that data is a player with an alt that has completed the story. That still comes out to 0.04% of the community, which no matter how you spin it, is completely irrelevant.