We were doing those things before we even detected ʻOumuamua. Whether or not ʻOumuamua specifically is extraterrestrial - which is not worth considering based on weak evidence - didn't change anything.

This is the problem: the evidence doesn't make the case, and "considering the possibility" doesn't lead anywhere interesting in terms of actual experimentation.

Billions of billions of stars, with planets and civilizations, pushing technology to new heights, but ultimately realizing that the best way to leave your handprint on the galactic cave wall is a Universe-wide message in a bottle.

I’m afraid we have more chances of making ourselves known by randomly throwing these bottles, than by answering back to where it came from.

This is precisely why an agency like ESA is developing its Comet Interceptor Mission, to be ready to chase future interstellar visitors.

This is basically the thesis of the article and the person you're responding to: the "orthodox inquisionists" are already doing this stuff, because they're not actually as close-minded as Loeb is making them out to be.