This whole article and its suggestions and conclusions are totally erroneous. They are based on a warped, inconclusive science of everything in the universe. For example. We don't even really have a clue as to how old the earth is. Carbon dating is false. From
https://answersingenesis.org/age-of-the-earth/how-old-is-the-earth/:
The results from some radiometric dating methods completely undermine those from the other radiometric methods. One such example is carbon-14 (14C) dating. As long as an organism is alive, it takes in 14C and 12C from the atmosphere; however, when it dies, the carbon intake stops. Since 14C is radioactive (decays into 14N), the amount of 14C in a dead organism gets less and less over time. Carbon-14 dates are determined from the measured ratio of radioactive carbon-14 to normal carbon-12 (14C/12C). Used on samples that were once alive, such as wood or bone, the measured 14C/12C ratio is compared with the ratio in living things today.
Now, 14C has a derived half-life of 5,730 years, so the 14C in organic material supposedly 100,000 years old should all essentially have decayed into nitrogen.19 Some things, such as wood trapped in lava flows, said to be millions of years old by other radiometric dating methods, still have 14C in them.20 If the items were really millions of years old, then they shouldn’t have any traces of 14C. Coal and diamonds, which are found in or sandwiched between rock layers allegedly millions of years old, have been shown to have 14C ages of only tens of thousands of years.21 So which date, if any, is correct? The diamonds or coal can’t be millions of years old if they have any traces of 14C still in them. This shows that these dating methods are completely unreliable and indicates that the presumed assumptions in the methods are erroneous.
Similar kinds of problems are seen in the case of potassium-argon dating, which has been considered one of the most reliable methods. Dr. Andrew Snelling, a geologist, points out several of these problems with potassium-argon, as seen in table 7.22
These and other examples raise a critical question. If radiometric dating fails to give an accurate date on something of which we do know the true age, then how can it be trusted to give us the correct age for rocks that had no human observers to record when they formed? If the methods don’t work on rocks of known age, it is most unreasonable to trust that they work on rocks of unknown age. It is far more rational to trust the Word of the God who created the world, knows its history perfectly, and has revealed sufficient information in the Bible for us to understand that history and the age of the creation.
Once you straighten science out, separating the theory and myth from reality, then you might be able to make an accurate guess about distant alien megastructures. I don't mean that the guess would be accurate as to the truth. It would only be accurate regarding guessing.
To say it simply, the whole of science on which this all is based is highly inaccurate.