Yeah, I know it's come up before. I can't help myself
Seven knows about the Borg assimilating Earth because of the message the survivors sent in "Regeneration". It's only by insisting that FC and ENT are an AU that there is a problem there.
Don't get me wrong, VOY and ENT have discontinuities just like every
incarnation of Trek. But I'll put direct canon evidence (see also IaMD, which ties directly into TOS, and TaTV, shitty as it is, which ties into TNG) and author intent over fan segregation any day.