This question is regarding the following tweet: https://twitter.com/yuriymatso/status/1281730109141954561
How was the original tweeter able to know that "Someone made a
$650K bullish bet via 24 July'20 $340 calls expecting SPY to go up at least 8% in the next 2 weeks." I am not saying what he said was right or wrong but just what did he see or where he saw what data which had him conclude this statement. I am sure this was something he may have seen in the option chain perhaps. Any help or even if you could possibly point to a resource would be very much appreciated.