No, it mentioned 816 out of more than 4500 respondents had net worth over $1M.

That's quite different to your claim.

That's also incorrect, it's not net worth > $1mm, it's "those with total household investable assets, excluding pensions, retirement plans and property" over $1mm, which is a much smaller number. The sources I saw said about 4% of US households meet this criteria, but 18% of survey respondents did.