I’m voting for a hoax here. For one thing, the name “Mason Froule” only crops up on the net in this one story - a good sign of an urban legend.
Trying to find the website of the “Oceanographic Laboratory Outpost” on Macquarie Island is equally fruitless.
Hmm… MASON FROULE = FOOL SURNAME. Possibly.
No hits in the archives of any UK newspapers from the period.
In any case, the story dates back to at least 1996, so such a thing, if it ever existed, has probably broken up. Think about it - what mechanism would cause just condoms to clump together in one area. Sure, you sometimes come across rafts of floating debris that accumulate thanks to currents, but I don’t see how the current could be, er, rubber-specific…