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I can't really see what the risk would have been. It's just liquid fuel and will mostly work or not work. They would have already tested heat generation and build-up of deposits etc. for many months.

Skin in the game. United CEO Scott Kirby is invested in SAF. https://youtu.be/XQtNEvVWPLc

These planes can run on one engine, so risk was small.

That’s a 737 MAX which uh, doesn’t fly with both engines…

Doesn't need both engines to fly...

The 737 MAX has had a tendency to crash despite having two working engines. Thus the joke: it doesn’t fly with both engines.