Per the manual
About Eye-Fi Cards
An SD Memory Card with a built-in wireless LAN (Eye-Fi card)
can be used with this camera.
Use of an access point and an Internet connection are required for
transferring images via wireless LAN. For details, refer to the Eye-Fi
website. (
WiFi SD Cards: Eye-Fi Memory Cards: Wireless Photo and Video Uploads from your Camera to your Computer & the Web | Eye-Fi)
Use Eye-Fi cards which have been updated to the newest firmware.
Set [Action Mode] of [Wireless Memory Card] to [OFF], or do not use
an Eye-Fi card in a location where the use of wireless LAN devices
is restricted or prohibited, such as airplanes.
Eye-Fi cards can be used only in the country in which the card was
purchased. Please observe all local laws governing Eye-Fi card usage.
This camera features a function to enable/disable the communication
function of the Eye-Fi card, however, we do not guarantee the operability
of all Eye-Fi card functions.
Refer to the Eye-Fi card manual for details on how to use the card.
Please contact the Eye-Fi card manufacturer regarding any
malfunctions or problems concerning Eye-Fi cards
I don't know what that refers to. But it would seem there could be a good reason not to build Wifi into the body?