The goalposts are moving. Yes to "worth considering" but that's not what I was responding to above ("is likely an alien device" ... "certainly seems to make that claim").
> Man that food sure looks tasty.
> You haven't even tasted it! Why are you saying it's tasty?
There are absolutely no claims that it's an alien artifact. What he is doing is providing reasons for why checking out similar solar visitors is something we need to do.
Likely: greater than 50% probability
Possibly: greater than 0% probability
Saying something is likely is a pretty strong claim. You can make meaningful decisions based on such knowledge.