To be fair, the org says "inner rooms" relates to congregations not kingdom halls. It doesn't mean that everyone will be expected to physically go to a hall to hide.
That couldn't be right, as with all the hall closures in recent years, it's often necessary for witnesses to travel long distances to the nearest hall, and also the fact that most halls are not big enough to hold all the local witnesses together. For example, where I attend we have seating for maybe 200 people max, but multiple congregations meet there probably totalling about 400 people. How could they all come together in the one hall without attracting attention of the authorities, and without causing crowding problems? It causes enough hassle with the neighbours as it is on Memorial night with all the crowding in and out!
The NWT parallels the "inner rooms" verse with Exodus 12:22,23 where the angel passes over Egypt and strikes the firstborn while the Jews hide in their homes with the doorposts daubed with animal blood, and that WT paragraph itself says: "Consider what Jehovah instructed his people to do when ancient Babylon was attacked..." Again, that was a situation where the people were distributed in their own homes and places, not all gathered in one location. One old WT from 2009 said: "This prophecy may have had its first fulfillment in 539 B.C.E. when the Medes and the Persians conquered Babylon. Upon entering Babylon, Cyrus the Persian apparently commanded everyone to stay indoors because his soldiers were ordered to execute any found out-of-doors."
Also, it contradicts their portrayals in the bunker videos of 1) the authorities probably closing down halls and 2) witnesses taking refuge in private basements or attics.
As enoughisenough says, their actions during lockdown went completely contrary to the idea of congregations coming together, and even caused some to wonder if isolation at home would be a fulfillment of going to "interior rooms". That would seem to make more sense if it happens at all, but I suspect the org doesn't want to say that in case it encourages more to stay at home and just connect on zoom, so instead they imply congregations should be "together", despite their depictions showing the opposite (only small groups in private rooms).
A case of putting their own organisational desires ahead of what the scriptures actually suggest? If so, that wouldn't be unusual.