That's pretty much the normal state of affairs--out-going admin people of whatever party always benefit from the revolving door.

Didn't work as well for Trump Administration officials because a large percentage of them are clowns who nobody wants to hire. Exceptions, ofc, being people like Mattis, who has found such a gig it seems (and would have been able to anyways, even had he not served as SECDEF).

Judging from how well the US market went, I thought everybody cashed in during the Trump years if at all possible. Wasn't that sorta the point (aside from the judges)?

It appears as though you did not read the article. What the article describes cannot be attributed to booming stock market alone.

No, was merely pointing out that "make out" was the goal and the market was only one of the mechanisms. I assume insiders had far more interesting/significant methods, but the market was amazing and I assume related things like real estate also did well.