Request #41385 has been Rejected by gromit [1]:

Without looking at the issue in detail: seblu[0] and eworm[1] are both
arch developers, so its safe to assume that they know what they are
doing in this regard.
The pinned comment[2] also mentions that there is a reason for the way
they handle deps like this.

Also the package builds just fine :)

[0] https://archlinux.org/people/developers/#seblu
[1] https://archlinux.org/people/developers/#eworm
[2] https://aur.archlinux.org/packages/virtualbox-ext-
oracle#comment-691385

[1] https://aur.archlinux.org/account/gromit/