The screenshots demonstrate the trader purchased only $1,040 worth of options, not "$22,000" as claimed in the tweet. So the trader turned $1k into $475k.

See the first photo in the tweet, the top left chart (45-day volume on the SPLK 127 C 09/22/2023 options) shows a volume of about 260 options was bought. The second photo confirms a volume of 260 (see "volume" column, first row).

Options are for 100 shares. So 260 options times 100 shares times $0.04 equals $1,040. Meaning the insider trader turned $1,040 into $475,000.

(Edited my math - an option is $4 as it's for 100 shares - thanks pc86.)