It's also in the article, which is actually a pretty good read. The short version is is very hard to make heat go anywhere, and you can only radiate it away, which is slow and inefficient compared to even basic air cooling.

Let’s them funnel some of that made up ai bubble money into the space race.

They have probably realised (or always knew) that ai wasn’t going to really make them the quadrillions they need to fill the hole in their soul.

They’d much rather be first in line when the solar landgrab begins

Significantly fewer NIMBYs

Because it gives investors in oligarch tech companies a boner and makes the line go up.

Double venture capital?

Because the greed stemming from the profits off of the AI funding circlejerk AI, has driven billionaires even more insane than before in their attempt to prolong the circlejerk before the bubble bursts. It is all about that shortsighted profit with them and their investors, and always has been.