Single Proc E460 (13th Gen) - definitely no PCIE cards allowed?

Hi There,

I'm wondering if someone can clear something up for me:

Is it true that a single processor E460 (13th Gen) can not take any PCIE NICs? Not even one?

The network guide says the following, but i just want to be certain that you can't add a single PCIE NIC to these nodes:

"Up to three additional PCI-e NIC can be added to the node, except single processor E460"

Input greatly appreciated, thanks.