I can vaguely remember the letter as well as an avid reader of said magazine many moons ago, I can't really remember what the response was though. I'm fairly certain it wasn't to the effect of "Yes, you are right, the scene was in the cinema and then removed", I think it may have been more of a vague "Hmm, we're not sure, does anyone else remember seeing this?" type response.
Watching back the scene of the saucer section getting obliterated during the destruction of Veridian III, there doesn't really look like there's time to cut away to the interior of the bridge: its only about 4 seconds long, so any cutaway would a) only be about a second long and b) would make a short scene into two incredibly shorter scenes.
A glance at the final draft of the script doesn't provide any clues either:
149 NEW ANGLE- THE PLATEAU (VFX-I) 149
as the RIBBON OF ENERGY TEARS ACROSS THE SCENE IN A
TERRIFYING TORRENT OF LIGHT AND SOUND. THE SCENE IS
WASHED OUT BY A BLINDING FLOOD OF RED LIGHT... Then
suddenly the Ribbon is GONE... and so are Picard and
Soran. The plateau is strangely and utterly SILENT
after the passage of the Ribbon... even the birds have
stopped chirping in the trees.
150 EXT. SPACE- VERIDIAN III (VFX-I) 150
As the ENERGY RIBBON rushes past the camera, a HUGE
SHOCKWAVE from the destroyed star HITS the planet and
it EXPLODES in a blast of fiery debris.
So it wasn't scripted, but then neither was the shot of the Enterprise on the surface.
On a slightly related note, I never noticed until the Blu-ray that the shot where Picard and Soran fade away as they taken by the Nexus has a rather obvious (now) looking CGI Patrick Stewart.