Well, the very own front baffle confirm this
.
View attachment 191488
Its not because the fact the whole assembly is sealed (which as you pointed out is not, since it has a “bass reflex port”) but because the Uni-Q driver array is sealed (the only from the KEF family if I can recall, maybe with the exception of the LSX, but can’t confirm 100%).
This means there is a special gasket acting like some sort of interface/suspension between the inner diameter of the midrange, and the outer diameter of the plastic member that supports the tangerine waveguide (mind that the exterior of the tangerine is like a tube that goes inside the driver and party surrounds the tweeter, in that inner part is where the gaskets supposedly seals the assembly).
Maybe
@jackocleebrown could help us with the specifics or technicality of the sealed Uni-Q array, that’s an interesting topic for sure.
Ps: sorry for derailing this thread with a different series from KEF.