Is the security of the airport's system OK?

This is a picture showing a Windows security warning message on the electronic bulletin board displaying the arrival and departure times of the airplane at the airport.

Although the content of the display is that the firewall is not set up and anti-virus software is not installed, is the airport system OK in such a state?

Details are as follows.
By the way, this is a picture that is displayed on the bottom right, "There is an icon not used on the desktop." It's not a security warning, so it's still okay.
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After all, security measures are something you want to keep firm.

in Note, Posted by darkhorse_log