I think the trade request is legitimate. Zaitsev did an interview in Russia 2 days ago where he bashed how the media (and I guess fans) treat the d-men.
However, it's not a coincidence that hours after this news broke, Dubas did a press availability, saying that they liked his game the 2nd half of the year, and he's paid reasonably for a long time, and it's not a situation where he for sure wouldn't be back.
It's no longer just Kyle Dubas calling teams shopping this player just to do it, but rather Dubas, and Zaitsev's agent calling teams saying that it's Nikita who wants a trade.
It definitely gives Dubas a better angle.