The comment on the website about ringing them up if you delayed your journey never used to be there, so it seems like they've updated their processes without necessarily updating the form.
If you have an email, and you then ring them up and they re-confirm it over the phone I can't see why you are worried. They have definitely become more flexible - I think Alicat on this forum had delayed her journey and in the past she would have had to apply using FLR(M) first, but she successfully applied using SET(M) directly.