It's certainly a good idea to run with the least privilege possible, but the article isn't quite accurate. The report in question was speaking about Microsoft software exploit attempts being mitigated, not people just running malware they find posted on a web forum. Most modern malware has moved beyond requiring admin rights. The trojans install themselves to user-owned folders and persist via user-writable registry keys.
For a wallet stealer, persistence isn't even required, and your wallet.dat file is lying right there in a user folder for the taking. It might need to persist if it uses a keylogger to capture your passphrase since it doesn't know when you will be typing/pasting that in, but as I mentioned, malware can persist post-reboot without needing admin rights.
So even though the advice is good for some cases, in the case of running random programs posted to Bitcointalk, it won't help you at all.
