That looks like a HST to me
I'm guessing you can download that reskin from UKTrainSim or somewhere like that.
Yeah that's an HST for sure.
Actually that's quite an interesting reskin as I don't think EC HSTs have ever carried that livery in real life. I'm sure they were all repainted into NX silver/white before the franchise was handed back so there wouldn't have been any left in GNER blue/red.