From Wikipedia
"The term
public domain has two senses of meaning. Anything published is out in the public domain in the sense that it is available to the
public. Once published, news and information in books are in the public domain, although they may also be copyrighted. In the sense of intellectual property, works in the public domain are those whose
exclusive intellectual property rights have expired,
have been forfeited,
have been expressly waived, or are inapplicable.
"
I meant the first sense, and if you link to the photo on their site you aren't copying it so I don't see that you could be infringing copyright.
I doubt they would be so stupid as to take the matter to court, the usual tactic is just to bully people into erring on the side of caution which is what they are trying here.
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