I actually addressed your criticism:
'a few minutes later (depending on the amount of plausible deniability vs. risk you're willing to take)'.
Never claimed that this was a risk-free method.

As we saw above, it took a whole 10 minutes for (maybe) a bot to sweep the funds.
It's rare, but I think you missed the point completely. It doesn't take 10 minutes to sweep the funds (and you shouldn't trust Blockchair.com on this). This is what Blockchair.com shows:

I give it half a second between the moment you broadcast the transaction, and the moment you see it disappear from the compromised address. Many bots are competing to steel those funds, and the fastest wins. You won't have minutes, you won't have seconds. Your money is instantly gone.
Very true. Similar to mixing and buying on decentralized exchange, I guess. Except you can keep / export Bisq trade records and mixing receipts. Would you recommend this?
It depends: your drug dealer won't care about receipts, your tax man will.