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I seem to recall that the anonymity of car is based on obscuring transactions through bundling, but that method was deanonymized by poisoning wallrts somehow. this was like 10 years ago so my memory is fuzzy.
Car? Autocorrect maybe?
I'm not XMR fanboy or expert, and it is some beautiful mathematics, but wayyyyyy over my head. That said, you might be referring to "ring signatures" that I guess you could say "bundles" the transactions together but that would be far too reductive, it's way cooler and more complicated than that.
If I recall, there was talk of possible attack vectors, so they made it even more private. I'll let wiki explain:
https://en.wikipedia.org/wiki/Monero#Privacy
So it looks like it was 2017 when they changed things. I know there was some discussion of switching from RingCTs to zk-SNARK (a form of "zero-knowledge proof") which, in and of itself, is an amazing cryptographic concept. I implore you to check out the wiki on it if you have any interest in cryptography or mathematics I think it's brilliant: https://en.wikipedia.org/wiki/Zero-knowledge_proof
So yeah, according to wiki, it seems as though they adopted zero-knowledge proofs... So not only ring signatures, but RingCTs (encrypted), plus ZKP, makes Monero pretty impenetrable. Which I think is cool af. As an engineer, I like seeing a typically abstract field/form of math be used in practical, real-world examples, as it doesn't happen often.