The price of the new $LUNA token has been volatile on its first day, starting at around $17 and later valued around $5.70. This would make the attacker's holdings of airdropped tokens worth around $12.1 million, assuming they could find liquidity to cash out.
All holders of Luna, who saw their holdings crash to nothing in the Terra collapse, received an airdrop of the new Luna tokens with the release of Terra 2.0 (electric boogaloo). The researcher who originally observed that at least $88 million worth of ill-gotten tokens had been siphoned from the Terra Mirror Protocol before a patch was quietly applied in early May noticed that the attacker had been among the recipients of the airdrop, receiving more than 2.1 million $LUNA. "A nice little reward for stealing money from thousands of Mirror users & locking their funds, causing them millions in losses", wrote the researcher.