Is Bitcoin really untraceable?

Here's a article about the FBI tracing the twitter hackers
https://www.zdnet.com/article/how-the-fb...r-hackers/

Excerpt
Authorities, with the help of the IRS, also obtained data from Coinbase about the Bitcoin addresses involved in the hacks, and addresses used and mentioned by the three hackers in the past in Discord chats and OGUsers forum posts.

Correlating data from the three sources, the FBI was able to track hacker identities on the three sites, and link them to email and IP addresses.

For example, authorities tracked Fazili down after he linked his Discord username from his OGUsers page, an obvious operational security (OpSec) mistake.

Fazili also made multiple other mistakes in hiding his identity. For starters, he used the [email protected] address to register an account on the OGUsers forum and the [email protected] email address to hijack the @foreign Twitter account.

He also used the same two email addresses to register Coinbase accounts, which he later verified with a photo of his driver's license.

Furthermore, Fazili also used his home connection to access accounts on the three sites, leaving his home IP address in connection logs on all three services -- Discord, Coinbase, and OGUsers.