You can make it simpler:
#let article(doc, title: "", subtitle: "", author: "") = {
set page(columns: 2)
set heading(offset: 1)
show heading: set text(16.1pt, weight: "bold", font: "Myriad Pro")
show heading.where(level: 1): none
let bold = text.with(weight: "bold", font: "Myriad Pro")
let place = place.with(top, scope: "parent", float: true)
heading(level: 1, emph(title) + " (" + author + ")")
place(bold(18.2pt, title))
if subtitle.len() > 0 { place(bold(17.15pt, subtitle)) }
place(author)
doc
}
#outline(target: heading.where(level: 1), title: "Articles")
#[
#show: article.with(title: "title one", author: "author one")
= Section 1
== Subsection 1
= Section 2
]
#[
#show: article.with(title: "title two", subtitle: "Subtitle", author: "author two")
= Section 1
== Subsection 1
= Section 2
]
