I don't really get your question, which was:
While the photons have been "marked", and therefore do carry "which slit" information, it appears that information was not recorded, and was only available "in theory".
Shouldn't that fact have destroyed the interference pattern if the VR hypothesis is accurate? Help!
... it appears that information was not recorded ... ?
Photons don't know their "path" - because there is none.
They don't carry information, ... they don't "are" photons, as in: particles
The information as to "which way" was available through the use of a "which-way" marker in form of a QWP.
A similar experiment (not sure if the one you referred to is to contradict or approve this one) can be found (by reference) here:http://bottomlayer.com/bottom/kim-scull ... ly-web.htm
It is significant whether that "which path" information could be retreived/extracted from the available data - afterwards.
If it is retreivable, one could know "which way" (for each individual one, this is important!) - and in turn "destroy the interference pattern" - which is a synonym of:
"noone knows or can know which way it went" ... ( for the interference pattern)
So, if it is retreivable, there is no interference - the path is known - and then, therefore, there is a particle.
In this case here, it could be retreived, as far as I understood it.
It appears to me that such information WAS recorded (rather than not, as you say)