I mean baby blue should never be used in architecture in general if you ask me, but especially not on an addition to a brutalist structure.
It would be an ugly structure if it was a freestanding building - being attached to an established structure which uses concrete as it's primary form of expression, it's an abomination. It goes further than not referencing the existing structure by just straight up trying to do the exact opposite.
A more appropriate solution would likely have been to either do something with a lot of translucent or gray glass and spandrel panels, trying to minimize it's visual impact, or to use precast to achieve a similar visual style to the original structure. Certainly no primary colours. Right now it's screaming "LOOK AT ME LOOK AT ME" and just totally clashing with everything about the existing station.