[gottago]

I believe they're the only broadcaster outside of Australia and New Zealand to show the series, so I'm not sure what the relevance of that is.

Um... because they're not the first and second seasons of the show?

Despite the conspiratorial tone, that still doesn't explain how it is supposed to "catch people out".

The more reasonable explanation is that they have bought the rights to show the revived series on the strength of Lord Sugar's presence. Because the chances of them showing the previous series is precisely zero, they have numbered it accordingly.

Yes, for their benefit. There will be viewers who will have been unaware that there were previous seasons and decided to watch for reasons I already explained. That is what is called catching people out.

That isn't catching anyone out.

You noticed quite a dull technicality and have drawn out a very odd conclusion.