There isn't any question that Iran proxies, including the Houthis, have been attacking American assets. No major actor disputes this. The tricky part is what to do about it. The Iranian proxies have been trying to strike a balance of harming/harassing US forces while keeping the attacks at a low enough level to avoid a major retaliation and full blown war. Calibrating the right response is not a trivial problem.

this ain't obscure APT hacking.

in this case it's pretty clearly the Houthi-let Yemeni government, which is a proxy for Iran, and all parties have been pretty vocal about it.