As an update to the community, the final distribution is available to claim on the Merkl platform, together with the interim.
Both distributions can be accessed on https://app.merkl.xyz/campaigns?campaignTypes=4.
Regarding questions of the asset distributed, in the case of stablecoins the final choice is dependant always on recommendations from the finance service providers. In this case it was Aave v3 USDC Ethereum (aEthUSDC), which is USDC supplied into Aave, with exactly the same value as USDC.
After claiming on Merkle the Aave v3 Ethereum, users that want plain USDC can go to the Aave Avara UI https://app.aave.com/?marketName=proto_mainnet_v3 (Dashboard on the top menu) and click “Withdraw”.