As they are insiders, I assume those are scheduled trades and not reactions to the market.

Yes, probably related to this:

"In January Denholm, Musk, and other board members of the Austin, Texas-based EV maker agreed to pay back a collective $919 million to Tesla in a court settlement stemming from a shareholder lawsuit that asserted the directors had overpaid themselves"

I'm very glad that Musks money is the last out as it was the first in :D

These sales were submitted in May of last year as they are officers of the company. This is a nothingburger.

Yes, this seems to be more related to the lawsuit the board settled after the court established malfeasance on their behalf.