No requirement for the RN to even be anywhere near the Falklands to deter the Argentines from even think of trying another invasion.
500 UK troops, SAMs and the Eurofighters on the islands are more than enough to deter the Argentines.
The Falklands have the infrastructure to take dozens of fighters and thousands of extra troops within 48 hours if required.
i dont think so.
Again, nobody thinks the Argentinians will be able to successfully take islands, not without years of build up and billions that they don't have.
but you still have to track and following any movements by the Argentinians. this will take ships and fatigue the airframes over time all adding to the british military burden. and every little bit of effort the british exert somewhere else is less effort they can spend to annoy china.
and its pretty standard practice. every time china send even a single frigate into the sea of japan, the japanese surveillance planes scramble and they assign at least one ship to follow, every time a single russian bear bomber goes around the british islands, nato escorts them.
that single frigate has no chance of invading japan or even doing a whole lot of damage nor does a single bear bomber pose much of a threat(yes i know they can be nuclear armed, but regardless that single bomber isnt going survive british defenses) but japan still cannot allow it to roam freely and un-tracked just as nato must escort the russian bomber.
a few potentially unfriendly ships around means they'll have to have their ships follow, stretching their already limited fleet, a few jets flying near the airspace means those Eurofighters will be spent all the quicker. all this is good for china, especially since china isnt even paying for it, it's in fact profiting from the sales, literally no down side for china.