Ok so a good sample size of a population is 10%. There are 76k people on the subreddit and of those you have 1,200 responses which is a about 2% or 1/5 of what would constitute a good sample.
But that's not even really accurate because you have about 2-5 million people who have purchased Bg3 since EA launched. The people on the subreddit are the most dedicated and involved of the playerbase. So they represent a sample with a "high possible degree of bias" towards certain results.
The hardcore gamers want a more accurate D&D RAW experience. I am one of those people. I am not going to assume the majority of players feel that way.
At the end of the day I have agency and can create the experience I want to have one way or the other.
That's not the thread but no, he's right.
Think about samples for elections. The margin error is (slightly) reduced with a greatest sample but the tendency remains the same.
In exemple polls with a sample of 1200 people about the american election of 2020 give the same tendency than polls with 35000 voters. The margin error is different (from 0 to 4%) but it wouldn't make a huge difference in this specific reddit poll.