With no other indication of a Mursaat presence in RoT, perhaps it is time to consider again the possible creators of the arcitecture.
There are several strong arguements that support the idea that Mursaat created the temples and similar architecture, not the least that they have been active in many places in the world.
However, there is a race that we know, provided the manuscripts are accurate, has also been to the temple locations, the RoT, and everywhere else in the world: the Forgotten.
Like I say, the arguements supporting Mursaat architects are strong. But for the sake of the pursuit of inquiry (and our duty to explain the inconsistencies of the Guild Wars world), what would history look like if all that architecture was built by the Forgotten?