Your question was framed in a slightly attacking way, so I think that's why he responded in that way. But I think he did answer the question.
If you're curious more about how it works, here's a conversation I had with a toxic maxi who I was pretty aggressive with elsewhere in that thread
quotingYou can audit the total supply of Monero by running a node and syncing the blockchain. Your node verifies every transaction is spending Monero once and not printing new Monero. Your node will tally up all coinbase transaction outputs to calculate the total supply. Monero has never had a bug that compromises the math. It's not Zcash.
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Monero leans on cryptography for more than Bitcoin does. Bitcoin leans on cryptography to make sure that only you can spend your Bitcoin and no one else can. That can break too.
