Polo Rules

The high sticking rule doesn't seem like it can be applied to scooping anyway, because the ball is not airborne:

§9.2 – High Sticking §9.2.1 – A high sticking penalty will be assessed
when a player attempts to contact an airborne ball at a height above
the nearest opponent’s shoulders.

However, the carrying rule might possibly apply, depending on what the player is doing:

§5.6 – Carrying §5.6.1 – Carrying is defined as picking up the ball
and carrying it in the air, in any hole in the mallet head, with
gravity providing the force which holds the ball in the mallet head.
§5.6.2 – Carrying is not permitted and will result in a ball turnover.

I don't think that what Luca was doing in Cambridge was carrying though, he was scooping, which is permitted:

§5.5 – Scooping §5.5.1 – A scoop is when the ball is cupped in any
hole in the mallet head using centripetal force and is maneuvered,
whether it be on the ground or in the air. §5.5.2 – Scooping is
permitted.

So, Luca getting called for high-sticking in Cambridge isn't really supported by the ruleset as it is currently worded. Sweet tricks ftw.