Surely much more likely a trading network, where things change hands multiple times before reaching destination, probably with key trading hubs.
In fact the tin was found off the coast - just as likely to have been on route to somewhere else.
From the paper: "Direct contacts between the British Isles and the Eastern Mediterranean are not assured at present, while inter-regional and international trade networks between the latter and northern and central Europe seem to be well documented for the second half of the 2nd millennium BCE [145–148]. "
https://journals.plos.org/plosone/article?id=10.1371/journal...
While I'm at this, it's no secret that coastal cities in Spain have Phoenician names: Barcelona, Malaga, Cartagena and Cadiz. Cadiz comes from "gader," meaning "boundary", and the Phoenician colonists there were charged with making sure nobody except Carthaginians would be allowed to sail west of there (and then on to Britain.)
> While I'm at this, it's no secret that coastal
> cities in Spain have Phoenician names
https://en.wikipedia.org/wiki/Hispania#Etymology
One must also likely compare the proposed root with Latin Hispania rather than directly with modern España.
This stemmed from things like Cornish place names having an unusual number of z's (a Phoenician letter) in them, and other similarities.
Even if the languages had not split, could there still not be regionalised influences on place names?
Rome, for example, was supplied by an unbelievable number of ships' worth of food every day. It would have starved without that ocean access; there's not enough nearby land to be used as farmland to grow all the necessary food in the pre-railroad era.
Railroads are the cheapest form of land transportation. But boats are cheaper still.
Tartessos is placed in the Guadalquivir estuary by Rufus Festus Avienus' Ora Maritima, but its exact location is unknown. There are some efforts to pinpoint it using satellite images, because its ruins could be buried under the sand.