I read systemd.network man page, there is no IPVLAN option in [Network] section. https://www.freedesktop.org/software/systemd/man/systemd.network.html
However I used that option in .network file, It works!
Is it accidentally omitted?
my simple three configure files.
#ipvlan0.netdev
[NetDev]
Name=ipvlan0
Kind=ipvlan
[IPVLAN]
Mode=L2
#ipvlan0.network
[Match]
Name=ipvlan0
[Network]
DHCP=yes
#wlp13s0.network
[Match]
Name=wlp13s0
[Network]
DHCP=yes
IPVLAN=ipvlan0
wlp13s0 is WiFi interface.
Probably you saw an older manpage version. Now the link you posted mentions the IPVLAN option. Obsolete question.