That's basically using a proxy, and so it has the same security. If the proxy is/geos bad (say, your VPS provider reveals your IP to some interested guys with guns), then you lose (anonymity). If your proxy remains good, then all that can be learned is the transactions originated at the proxy. However, the proxy does serve as a potential pseudonym, and so if the collection of transactions reveals something identifying, even if any one transaction doesn't, then you lose.