Nope. This is not fascism. You should read the article and you will see two aspects:
1. If you called me a murderer on a public platform without evidence to support your claims, I would sue you for defamation and libel. That would be fair. This person explicitly stated that the "product is killing people". Yes. She said tomato puree that was too sweet for her taste is killing people. This is exactly that the company has done. The right to free speech is not a license to spread misinformation and lies, especially if they transgress on someone else's reputation and rights. I am not saying whether the accusation is correct or not, that's for the person to justify to the court.
2. The person has then refused to accept court summons and be served, which is what led to her charge and arrest. This is perfectly standard in every country that follows some derivation of English Common law.
In my opinion, what is happening here is that people have a tendency to treat online publication as sort of vaporware - something that isn't real and will not have consequences. Like writing on Facebook is somehow less "real" than writing such a thing in the daily newspaper. This is especially true in parts of the world where widespread penetration of online platforms has happened relatively recently. People don't know how to deal with online media or don't even take it seriously. The more advanced countries like the US went through this phase in the 90s...resulting in several scandals about online postings etc. This person is discovering that just because it's on Facebook , she can't make serious accusations about homicide and expect to not face consequences.