TWTR trading volume is I guess $1B - $2B a day (Y! says 38M units avg) shuffling stock between lots of small buyers and sellers. Musk wants to buy 25x to 50x that.
If you sell oranges, you might have them priced at a dollar each. The guy in the stall next to you thinks the exact same oranges are worth more. He prices them for sale at $2, and the guy next to him for $4. Neither of then sell anything though. A single person comes by for an orange every morning and that’s all the oranges that get sold that day in your town. This person buys their one orange from you and the town crier reports the ORNG stock quote as being $1.
If some rich guy comes along and says “I will now buy all the oranges from all of you”, the average price is going to be higher. The town banker advises you all that while their offer of $2.69 is high, you could definitely, ahem, squeeze them for more.