I honestly don't see how he expects that to work at all.
If I see you go into a closet with nothing and come out with power armor, then go back in and come out with exponentially more and better stuff every day I don't need to know what you're actually doing in there to extrapolate that you're scary and growing scarier very quickly.
Yeah, but the
how is important here. Keep in mind bigatons alone won't actually make a big difference for an Endbringer. You need Deathstar grade firepower to just kill their avatar. What he's trying to hide is his exotics and exponentials. Singular dangerous combatants, or ones with small numbers arn't
that big of targets for her. Regardless of his power, he operates on too small of scale, at least mostly.
This very conflict shows it, in truth. The way that the ABB, despite Joe steamrolling every group he runs into, is
still hitting a lot of their targets, because they have the numbers to operate on a 'macro' scale.
Ziz when she's narrowing down specific targets, tends to goes game changers, innovators who open up new fields, can influence many others. Linchpins and catalysts that can cause great good, or great damage to the world at large. People like Sphere (Preventing easy space access), Taggert (major figure in the PRT, one of the agents primarily responsible for mitigating her own damage), and Echidna (released a ton of Cauldron secrets tying up Contessa for weeks).
Right now Joe's growing stronger yes, but he's also mostly keeping his stuff to personal, or at least small scale. The biggests bits of true Ziz bait he's dropped were helping Weld (minor, since again it's individual level stuff), and the Fusion reactor thing he tried to bribe Dragon with (that was a more serious danger).
An army of drones though? Going full mass production and not just limited production? That makes him a possible source of something like Dragonsteeth, a resource that can supplement capes in a way that upsets the current dynamic, and could help stabilize things. It also makes him a potential
Machine Army, something that could do massive damage to the world at large, further bringing it into chaos.
Mass manufacture is pretty much
the damning nail for him. If people ever expected he could truly go von numen in some way or another, he'd cease to be a curiosity and rising star, and immediately become something to dangerous to let continue to roam free.