Re: V'Ger 6 + "more than three hundred years"
At the time, the timeframe of ST hadn't been locked down yet. Looking at it retroactively, it clearly doesn't fit what's now been established about the chronology, but it's easy enough to assume that Decker's memory of historical dates was imperfect and he misspoke.
Right. The first time Star Trek
is actually stated to take place in the twenty third century is in TWOK.
"Many things seem clever to an imbecile." --Captain Thelin th'Valrass, USS Enterprise-- "The Chimes at Midnight"