The team is Israeli, the rider is Canadian and the governing body is Swiss, so unless the paying agent is EU-based I doubt it will be an EU court deciding here. Having said that, unless somehow Netserk is familiar with the legal system of any of the three above countries he is talking out of his ***.
It could depend where Gee signs next and whether the UCI place sanctions against him etc. As well as how his contract etc is laid out... as he resides in Spain and works mainly in the EU and will be paying taxes in Spain etc and therefore likely considered an EU based worker... complex and frankly hard to know without knowing details we cant possibly know.
But if he signs with an EU based team? It would be the Diarra route...
if Ineos? Not sure. Maybe it would be EU effectively as sure Ineos are basically operating out of Deinze for all intents and purposes and likely contracts signed with an EU branch of Ineos.
Also, IPT probably have a similar set-up with logistics hubs in Spain, Belgium etc and staff on local contracts... depends but a lot of teams do I believe.
But even if ends up in UK Supreme Court, while no longer obliged to follow ECJ - still does in many cases, and may well in the case of "competition law" as UK competition law is very similar to EU even after Brexit, as a lot of the competition law in EU was created in UK beforehand and then shaped by UK's time in EU as well
In the Diarra case:
Loko are Russian
FIFA is Swiss
his new team were Belgian...
It went to CAS first, then to Belgian court (where Diarra resided and his new club was that he was not allowed to join) and then to ECJ.
If the UCI ruled unfavourably against Gee and banned him etc, or upheld a big, big amount of compensation from Gee to IPT? If it was an EU team he signed with or he is a EU worker? He almost certainly wins the case given precedence. If it is Ineos and UK based Ineos contract? Less certain BUT most likely UK competition law will not fall too far away from ECJ's ruling.
and the result going off the Diarra case would be not very good for the UCI.
Especially given that most of competition law in cycling is within the EU and under the ECJ's remit (11/18 pro teams and basically 90% of transfers between at least one EU based team, and almost certain most of the other 7 will have guys on "EU" contracts)...
FIFA ended up having to basically adopt the Bosman ruling despite it being an EU ruling...
It is all very interesting from a legal basis.