Question about Morde's Q

The info on his League Wiki is out of date so I'd like some clarification from anyone who is 100% sure on this:

How does Morde Q interact with spellvamp/lifesteal? I tried it with lifesteal and it didn't seem to work (unlike nidalee Q?) But I also tried it with spellvamp and it seemed to work a little(?) but not as much as I thought it would... On the other hand most of the stuff on the wiki seems to say that effects similar to Morde Q shouldn't proc spellvamp at all.

Does this mean that morde, a champion who has HP costs, can only proc spell vamp with E (and ult), whereas he used to be able to proc it with Q, W, and E? :(

references: http://leagueoflegends.wikia.com/wiki/Spell_vamp > Spell vamp applies to nearly everything that isn't classified as an auto-attack. This includes most abilities, but also includes activated item effects (e.g. Hextech Gunblade item.png Hextech Gunblade) and Smite.png Smite. On-hit damage modifiers (e.g. Siphoning Strike.png Siphoning Strike, aka "bonus" or "additional" damage), on-hit damage over time (e.g. Seastone Trident.png Seastone Trident and Toxic Shot.png Toxic Shot) and abilities that apply on-hit effects (e.g. Parrrley.png Parrrley and Mystic Shot.png Mystic Shot) are classified as auto-attacks, and will not apply spell vamp. Any physical damage dealt will trigger life steal, while any magic and true damage dealt trigger neither life steal nor spell vamp.