If this really is a Dyson Sphere (or something similar), then they already were extremely advanced when they got started. Probably thousands of years ahead of our current technology.
I personally do not believe this is aliens. It’s just too improbable. Much more likely some as yet unexplained confluence of natural events, gas clouds, exploded planet, whatever.
However, the subject is interesting and if I was the boss of the James Webb, it would be a primary target under my direction.
The details of this star’s dimming was discovered by analyzing Kepler data.
One technology I do believe in: space telescopes.
The more, the merrier. The bigger, the better.
It would be very sad if it were really Dyson Sphere.
It would mean that there really is no way to cheat the speed of light, or even do effective STL travel, and that we are forever confined to a single system.