I'm sure that's part of it, but the fact that it ends with Spectre saying something bad will happen over Diana saying good things about Jon makes me...
The recording was without context. It showed Wanda using her magic to open the door and break into the room they had Vision in. What was left out was...
They're not going to fully establish mutants, but they're going to open the door to entice people and to set up stuff later. It's the MCU, you think...