Mars is the spoiled planet, and will be until some point technology is a lot further along. The rich are not going to run away to some wonderland. Earth is the garden, and nothing else is like it in space.
Otherwise you've gotta start stacking disasters to get close, and even then it's pretty difficult. Mars is really bad.
Also, it is not like you couldn't vastly more cheaply and easily build Mars bunker on Earth. As we are centuries away from planet scale geo-engineering.
If we did, it would still work better to just use it here on some isolated land.
Such a ridiculous idea puts the rest of the article in a very questionable light for me.
The earth-sized radio telescope made out of Starlink transceivers is an obvious winner. Total coverage ground radar using the transceiver antenna is another.
The rich would spoil Earth and defile it and then move off to the ultimate gated community of Mars, leaving us to deal with the consequences of their actions.