I think I've posted this before, but via gameday data - which is really the only "data" we have for a lot of minor leaguer defense - Robert was the second best defensive player in the minors last year.
"ZiPS projects Robert to be a +4 defensive player in center field, a solidly average contribution at a position where there are lots of excellent defensive players. But there’s perhaps more reason to think that could be wrong in this instance than with the typical player. ZiPS was ambivalent about Robert’s defense over his first two minor league seasons, both of which were hampered by injuries. In 2019, using the probabilistic estimates I used for minor leaguers based on Gameday hit location data, zDEF really liked Robert’s defense. Of all minor leaguers at all positions, ZiPS had Robert as the second-best defensive player, at +20.9 total defensive runs in the outfield (+20.5 range, +0.5 error, -0.2 arm), behind only Michael Siani of the Reds. That comes down to +4 because it’s just a single year of less-than-ideal defensive data. But what if Robert’s a +14 defensive player rather than a +4 one?"
https://blogs.fangraphs.com/the-white-sox-playoff-road-is-parallel-to-the-luis-robert-expressway/