The page has an icon that says "Hacker safe" but doesn't even use SSL when transmitting your information.
They do send the form to: https://salesforce.com/servlet/servlet.WebToLead?encoding=UT...
But as we all know if the form itself is in HTTP then it can be intercepted and modified to send the info to an attacker's own web-server making the fact that they're sending to a HTTPS-enabled server really rather meaningless.
HTTP form to HTTPS essentially breaks HTTPS's MITM protections, it only keeps the encryption somewhat in-place (although with a successful MITM the encryption is effectively disabled).