XPath predicate on wildcard

I am trying to get a (for me!) complex XPath expression working, and having trouble. If I use this it finds all nodes in the Arch Package Set, including Removals.

$SetExpression = "/Definitions/PackageSets/PackageSet[@id='Arch']/*"

But if I do this it returns nothing, rather than returning the two Rollout nodes that are there.

$SetExpression = "/Definitions/PackageSets/PackageSet[@id='Arch']/*[Name!='Removal']"

So, is it not possible to apply a predicate to a wildcard?