Do the Greens really mean what they say?

Advice from the Cornish Green Party on who to vote for in those constituencies, currently Newquay & St Austell and North Cornwall, where they do not have candidates:

"do not vote for either of the Lib Dem or Tory (or Labour, although they are pretty irrelevant in Cornwall) candidates as we regard them as indistinguishable and fatally weak on economic and environmental matters. We would also not vote UKIP as their little england attitude has no place in the modern world. If there is no one else you can vote for, we recommend you write in Green on the ballot paper."

No mention of the fact that the British National Party is fielding candidates in both of those constituencies.