Evidence suggests Mars had oceans before and they just evaporated due to the thin atmosphere and non-existant magnetic field no?

I'm not sure how that would get solved without some active technological solution by humans let's say.

I'm not sure which is more practical. Diverting enough material to replicate earth's natural magnetic core system on mars into the planet, or building an artificial system. The knowledge gained from attempting either is likely valuable.

Synthetic magnetic field is much easier than messing with the planet's core. Put a relatively small power plant in the Sun-Mars L1 point, and attach to a big conductive ring: https://phys.org/news/2017-03-nasa-magnetic-shield-mars-atmo...

Fucking journalists publish an article with magnetic dipole measured in Teslas... So I go to the linked paper, and it has basically the same contents, on basically the same wording, with the magnetic dipole measured in Teslas.

It appears that at some point, somebody involved with this knew what they were doing. But we are removed so many steps from that person, that anything said there could as well be Star Trek techno-jumble. Including the conclusions.

Over a timespan of hundreds of thousands of years.

Which is short in geological terms, but an eternity in technological ones. We would have plenty of time to solve that problem.