The Orion ship that arrives to collect Tendi is inspired by the one introduced in “The Pirates of Orion”, but appears to be a more modern iteration of that craft, as well as being significantly larger.
There have been a number of references to that episode this season, but STILL no one has said "Oreeeeon" or worn a silly green jumpsuit/helmet combo. Like what are they even doing?
Frankly, the scene that introduced Stamets and Culber together I think was intended to surprise the audience in a different way –– Stamets is a huge jerk the previous few episodes and set up as a semi-antagonist, and that bit shows him in a very different light, as the audience/Burnham starts to thaw on the Discovery crew.