Ok... I just asked the author. Would love to know and confirm how this functions here. 

How do you know? Are you able to see it somewhere? 

 You can look at the note json for a content warning:

http://njump.me/nevent1qqsfhnsenm6mnczuxrjec9ukrpn6hxjrqh36ez3prjhn7d57lda7emqpr3mhxue69uhhyetvv9ujucnfw33k76twwpshy6ewvdhk6tczyr3vea70ypqr70e2ff2mx28smca78p2c5l2lxd3jlk4wl3exc8ywkqcyqqqqqq

https://i.nostr.build/GNdbq6rKcyH70ZGV.jpg