All of what you quoted is speculation.
The only evidence there is for aliens, is that it can’t be dis-proven at this point. However, there are no data that DEFINITIVELY proves that it is alien tech either.
So taken from that, what is most likely?
A weird ancient comet/meteorite, stumbling through space.
Or a targeted probe that was sent from another starsystem? Okay…
Lets go with the second one for a sec.
Closest star to our solarsytem is Proxima Centauri at 4.35ly.
Oumuamua was traveling at 26 km/s compared to the interstellar medium.
That gives a traveltime from Proxima Cen. of 47222 years.
It is far more likely to be an anchient comet than anything alien.
It is never aliens, until it is.
Aliens are a extraordinary claim, and therefore also needs extraordinary evidence and data.
This paper is a hypothesis where they explore the possibilities for some of the discrepancies there has been observed. Again. This paper is little more than speculation on how to explain these. Interesting speculation, for sure, but don’t let single papers convince you of such mad ideas like alien probes.
Yes, it is a possibility, yeah… But it is HIGHLY unlikely to be of alien origin.
Wait or more papers mate. There will be more.
Until then, Fly safe o7