The text on link says kmod-be2net-12.0.0.0-9.el9_0.elrepo.x86_64.rpm
but the link points to kmod-be2net-12.0.0.0-10.el9_1.elrepo.x86_64.rpm
Pay attention to the el9_0 and el9_1. These packages would be appropriate for kernels of
Rocky 9.0 and Rocky 9.1, respectively.
For kernel of Rocky 8.5 (where did you even find it? Should use 8.7 now) the correct package
should be kmod-be2net-12.0.0.0-8.el8_5.elrepo.x86_64.rpm
nmcli device show is quite verbose. To simply list the devices: nmcli device state
(or just nmcli d s).
Since you show only devices ‘virbr0’ and ‘lo’, the driver is not loaded (and el9 kernel module simply does not load to el8 kernel).
When correct kmod is installed, it should be auto-loaded on boot.