So, disclaimer: I'm not Russian, I'm not a lawyer, blah blah blah.
This is the law they're talking about: https://www.humandignitytrust.org/wp-content/uploads/resources/Briefing_on_Russias_federal_anti-propaganda_law.pdf
So yes, the game is already 18+ in Russia and therefore the pack itself would be allowed.
However, the marketing is a whole other thing. The video trailer definitely violates the example "Using emotionally charged images for discrediting the traditional family model and promoting alternative family models. For example, a couple in non-traditional sexual relations can be represented as bright and charming." Also "Social approval. For example, direct or indirect approval of people who are in non-traditional sexual relations." So they would have to redo all their marketing, or just not advertise in Russia at all.
I'm also not aware of whether just the cover image in Origin counts as "propaganda to minors." There are "child accounts," and while I find people complaining about whether they can play certain games online I'm not seeing transparent descriptions of how age limits work in Origin. Again, not Russian, not a lawyer, and therefore can't say whether that would be a legal issue or not. That said, from Wikipedia: "In November 2014, one day after current Apple Inc. CEO Tim Cook publicly announced that he was proud of being gay, it was reported that an iPhone-shaped memorial honoring its late co-founder Steve Jobs had been removed from a Saint Petersburg university campus by its installer, the West European Financial Union (ZEFS). It was alleged that the memorial was removed due to the law because it was in an area frequented by minors." (https://en.wikipedia.org/wiki/Russian_gay_propaganda_law)
Again, not a lawyer, not Russian. I hope that helps anyway.