I was wondering the same but then tried the same word order, only with 'raining' instead of 'rains' and it's correct. Now, I think it's maybe even logical....It's raining atm but you won't ever say in English 'It rains there'. You could say 'It often/barely ever rains there', for example.
Nobody here in the UK would say that, I agree, because we get rain in every part of the country, :) but I can imagine some places in the world, where it would be true to say, "In the east it rains", with the implication that the west doesn't get any rain.
The pronunciation of regent is wrong, what he says is actually "regent" (also regent, in dutch)