The day you can show one of your UTXO spend itself at random without you initiating a transaction then maybe it’s quantum (more likely you have been hacked).

Really check your definition of “probabilistic”

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That’s not what I am saying. Yes you have absolute certainty about your UTXOs only because you are the owner and controller. No other UTXO will have absolute certainty and its location in the next block is probabilistic. I’m talking about the entire UTXO set.

And regardless, you can broadcast a transaction with high fees and not get mined; it’s still probabilistic even when visibly broadcasted to people’s mempool.