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Yes, it can be.

Accusing someone of cheating on you by posting their personal information and sordid details of the affair on the internet and trying to get as many people to read it as possible? Yep, I'd call that slut-shaming.

That's a very generous description of the zoe post.

If Eron wanted to only accuse Zoe of cheating on him, he could have done that and left it there.

He accused her of being a shitty human being - lying, cheating, denying the above, deceiving the author to have unprotected sex with him (should she be locked up in an embassy?), having double standards/no principles... Still, I can see no slut shaming in the text.