My point is you are conflating two separate issues. Regardless of whether they observed a signal or not, people have theorized based on the energy required what type of civilizations could produce certain signals. Those theories are not based on whether said signal has been observed in reality but rather based on as the name suggests a theoretical framework. So the theory predates any actual observation.
That is in many respects how science works. People come up with theories often times before something has actually been observed so your argument here would be like someone getting upset because Einstein offered a theory that predicted the existence of the black hole prior to any actual observation or evidence that one should exist.
You remove the element of people theorizing about things prior to their actually being observed evidence of said thing and science would grind to a halt.
I get it, but my point stands.... hold off on spewing your theories about their technology or society until you can confirm an actual signal from an alien civilization.
Otherwise all you are doing is spewing guesses like an asshole.
OMG if this signal is real, and if it is omni-directional with this level of power, and if they are powering it by harnessing the power of their Sun, then they must have a technology of level X and a society with parameters A, B, and C.
That is a lot of IFs without you having confirmed shit.
I don't disagree with the theoretical exercise by any means, but applying it in practice when you have no basis to be applying it is misleading and stupid IMO.