They're not justifying it. Thiel was a big supporter of Trump and lobbied to get Levandowski a pardon, so Trump is returning the favor.
https://www.bloomberg.com/news/articles/2020-08-24/thiel-bac...
Dumb question, if Levandowski used the (allegedly) purloined IP at a new employer, could he be charged with a new crime or would he be clear to proceed under double jeopardy?