Usually one the form
parameters of #cite()
could achieve this but it seems not with this particular style. The easiest way right now then would be wrapping the normal citation in a function and remove the parentheses with a regex.
#let no-paren-cite(label) = {
show regex("\(|\)"): none
cite(label, form: "normal")
}
See @xyz (reviewed in #no-paren-cite(<abc>)
#no-paren-cite(<def>))