Okay, that page looks good to me. Have you ever submitted the form to allow Marketo to see it at least once? (We were discussing a similar case recently here: https://nation.marketo.com/message/218630-re-clicks-link-on-web-page-trigger-not-working-for-smart-c... ).
Anyway, I've submitted your form. You should see my record in your Marketo database now - firstname.lastname@example.org. You should see the Form Submit activity and the Visit Web Site activity. I'm hoping that this should help your trigger campaign find that page too.