I don't know there that much, but I'm sure I'm part of the club.
I'm happy to know the number is big, not like what I expected, but is there any way to verify its accuracy?
The number or graph shown on the tweet can't be deemed as accurate because nothing was mentioned about each of the addresses being unique or not.
There could be more or less people who potentially owns 1 BTC but i'd say more as others could be moving their BTC constantly(for profit) through trading, lending, investing, etc then buying it back to complete their 1 btc in the future.