Is XMR truly untraceable? The Bitfinex hackers moved some of their BILLIONS in Bitcoin into Monero, got caught

From the article found here: https://slate.com/technology/2022/02/bitcoin-couple-scheme-rap-heather-morgan-ilya-lichtenstein.html

What the Justice Department’s report refers to as “anonymity-enhanced virtual currency” is more commonly known in crypto parlance as “privacy coins.” These are types of cryptocurrency that have special features to help users obscure their identities and transactions. While other major cryptocurrencies like Bitcoin have publicly available ledgers recording all transactions, privacy coins can purportedly make transfer amounts or the parties involved confidential. The Justice Department specifically accuses the duo of converting the Bitcoin into Monero and Dash, which are widely considered to be privacy coins.

So yeah, they allegedly laundered (disguised? hid?) $4 billiion of bitcoin. They've been arrested, and the FBI will do it's investigation.

What are the chances that Monero has been cracked?