If the mod removes the title and puts what he or she wants it to say in its stead, it is censorship. The interwebs define censorship as the suppression or prohibition of speech. I don’t know what else you could call it.
No, that is editing, to ensure the title is both brief and reflects the evolution of the thread.
Changing the post or any other substantive content in the thread would have been censorship (unless done for purely practical reasons like combining duplicate threads).
As I posted earlier, it would have been fine/desirable to also include reference in the title to communication problems.
Or I guess the title could be far, far, longer and include the facts that the OP ordered from Photoimpex, shipment was delayed, wasn't getting a response from Photoimpex when he tried to reach them, asked for a response here, got a response and explanation, learned about difficulties with shipments from Europe to the USA using DHL, etc., etc.
Titles are organizational and functional tools. And they are intended to be brief.
As an almost entirely irrelevant aside, it is a principle of statutory construction that the titles and subject headings of legislation have no effect on the meaning of the legislation itself.