They are in the period costumes so to say (and are not moved into our time), but there is piano there on stage that is a little strange perhaps. Also there is harp there as well as Russian folk instrument gusli that bards of the past used to accompany themselves .Maybe this is not very authentic.
Ah, but later on everyone is in a contemporary night-club, complete with striptease :( All of Cherniakov's productions are exactly the same. Computer screens (Macbeth). Banquet tables (Aida, Macbeth, Evgeny Onegin). Striptease (all operas). Ho-hum and an elephant's bum. But he's the "most highly paid opera director working in Europe".