I used one of the bots you get from From the Scrapheap and played it while I had Zilliax’s aura +1/+1 buff. Here is the screenshot: https://imgur.com/a/GKtxnZW.
I am confused because I am unsure whether the aura should apply to the mech before it magnetizes but the stats of the magnetized minion don’t make sense either way as it got +1/+2 as a result.