No. The notation $variable->(@args) means de-referencing, i.e. invocation of a subroutine reference (or "anonymous subroutine").

Method invocation for $object is generally written as $object->method(@args) (unless the content of the scalar $object is a subroutine reference, which is rarely used).

So I guess, BrowserUk really meant

$Qwork->enqueue( @generation, (undef) x $noOfCores );
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or such, but that's just guessing.