Reapers vs banish

[Seljuck]

Hi,

Need confirmation, reapers are outsiders, banish effect from items like Riftmaker do On Hit: 4 to 24 Bane damage to Outsiders. On Vorpal Hit: If an outsider struck by this weapon has fewer than 1000 Hit Points, it is instantly slain. If the outsider has above 1000 Hit Points, it takes 100 damage.

But it's not working on reapers at all. No dmg, no effect at vorpal. Is it bug? Or reapers are not outsiders ?

[Iriale]

vorpal effect can not work because all reapers have deathblock. This at least is WAI

[Drunkendex]

Not to mention, a LOT of outsiders are immune to Riftmakers bane damage.