This country speaks out both sides of its mouth all day every day. My estimate is the FBI will appeal, likely end up with a Trump-appointee presiding over the appellate court.
(I’m not gonna argue whether this is good or bad; I’m just stating facts)
While it is true that Trump has appointed a record number of judges during his term, it’s still only about 1 in 4[0].
As for the Courts of Appeals specifically, it’s about the same. Wikipedia says (as of May 21), he’s appointed 51[1], of which there’s a total of 179[2].
[1]: https://en.wikipedia.org/wiki/List_of_federal_judges_appoint... (“As of May 21, 2020, the United States Senate has confirmed 196 Article III judges nominated by President Trump, including ... 51 judges for the United States Courts of Appeals, ...”; “There is currently 1 vacancy on the U.S. Courts of Appeals, ...”)