Just because someone places hashtag on his twitter account doesn't make people go and buy bitcoin.
Sure. But everything happened literally at the same time, within a few minutes. Could be totally a coincidence, but what are the chances? I even added a chart from Google Trends. Were those whales searching for "bitcoin" then?
Do you know how long it takes someone to sign up on an exchange, go through their KYC process to verify their account, make money transfer from their bank account to that bitcoin exchange, wait a long time until it reaches the exchange and is credited in their account and then eventually after jumping through all the hoops they can buy bitcoin?