Question: I have KClip as the last plugin on my master bus and it oversamples offline at x32.

Does this mean that it eliminates all aliasing artefacts on my render?

Nope. It's likely to not eliminate any prior aliasing artefacts.

Thanks for the reply Mikael.

You can work at higher sample rates and use something like Tokyo Dawn Labs Ultrasonic plugin before and between non-linear processes. That should eliminate alot of aliasing issues.

Yes. Thanks for answering in a more useful way. I was just about to log out there.

Besides TDR there's also the AirWindows Ultrasonic series.

The main approach is to work in a higher sample rate, which in itself prevents much aliasing issues, and use one of the these filters before any step likely to produce frequencies going over 20 kHz. The folding of which is attenuated because of the higher sample rate and the ultrasonic filter makes IMD artefacts less likely. So it's a double pronged strategy solving two problems to. Not perfectly, but clearly better if done right, I think.

The other approach would be to stay at base rate and use plugins that are known for high quality and little aliasing (like the mentioned TDR ones). Or use the plugins that are known for aliasing (like the infamous but still great Decapitator) only in a context where it probably won’t be a major issue (e.g some light saturation on a bass track).
This of course requires some knowledge about the processors you use.

The third option would be to wait a few years until aliasing becomes fashionable again: “remember that crunchy sound from those vintage digital plugins? If only I could run the original Decapitator version on my system, the one before they switched to 128x oversampling…”