it is(down toward the bottom), you notice no where does it say “in game recruit armor”, but rather, the PRIME skin FOR the recruit armor. and if that doesnt convince you, the description for the armor is that it is the “default armor variant given to all spartan recruits” (not word for word). PLUS, the armor change icon is the Recruit Helmet. If it was exclusive, they wouldn’t use its silhouette as an icon. (the lives icon for firefight in Reach comes to mind. that icon is also the default helmet)
You can argue whether this is a good or bad thing, but I’m glad that it isnt exclusive, I think it’s my favorite helmet so far, just because of its simplicity and also because it seems to look like the only “classic” new helmet. my sympathy goes out to all the people who preordered in order to get the “exclusive armor”.
EDIT: sorry if this is old, I thought the argument was still going on.