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The paper he discusses claims that Bitcoin private keys are only vulnerable for about 10 minutes, but that only applies to P2PKH (pay to public key hash) with never before used keys.

However, millions of BTC are vulnerable with no quantum computation time limits. This includes about 1.75 M BTC in P2PK/raw multisig outputs, and over 4M BTC due to known pubkeys and scripts, revealed in the Bitcoin blockchain.

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The 10 minutes also isn't accurate because the ability to obtain private keys from public keys would completely destroy the incentives of the Bitcoin network. Miners are incentivized and compensated for including transactions in a block due to fees. The ability to steal the coins from an incoming transaction would create incentives not to include transactions in a block and to instead spam the network with as many malicious nodes as possible to halt the proliferation of transactions.

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