It might depend on what your definition of "elite" means, but he is still pretty damn good, if not great on D. Using metrics for OF'ers involves smaller sample sizes than IF'ers, and who plays next to you factors into the metrics as well.
Here are some sample sizes of the larger variety:
JBJ: UZR/150, DRS, Inning in CF
First 4 seasons: 9.5 (8th in MLB), 27, 2695
Last 4 seasons: 5.8 (10th in MLB), 20, 4725
2015-2016: 7.0 (9th), 14, 1600
2017-2019: 4.8 (9th), 16, 3370
2018-2019: 4.5 (10th) which ranks him higher than DeShields, Trout, Hicks and Pillar.
As you can see, while his UZR/150 and DRS per innings declined, he has stayed ranked 8th to 9th in most 3-4 season sample sizes, which are the sample sizes suggested to be used by the creators of these metrics.