You'll have to take that up with Miles and Kerry, they're the ones who said its canon.
And yes, IQ is between 1 and 2
They said its canon-adjacent, which fair enough if its 'Canon', but that just means its sidelined as secondary. they give creative freedom for the producers of IQ to mess with the proper story in ways, and only mainly count the unique story. Either way, Nightmare Weiss and Blake would get their own profile, and this shi just happened in a dream lol
Its...just not though?
I dont know how capable you are to think for yourself but...
'The first two episodes of RWBY: IQ will recap V1 - V2 before kicking things off into a bold new adventure, full of new characters, new settings, new surprises, and (of course) new Grimm.' - (This statement doesnt imply start of v1 to end of V2 either specifically)
RWBY IQ only recapped V1 in those 2 episodes (it was 3, already this is wrong). There wasn't a shred of V2 in these episodes. IQ ended with a direct V2 scene, and directly goes against what happened in V2 by the end of it, like the fact RWBY would have already met Suns team, yet never got introduced by the end of IQ. This was likely just incorrect on their part, cause as you clearly shouldn't be able to argue, theres not a shred of anything in V2 except it ending on the very first episode of that. If i were to guess, they just wanted to clarify that IQ wasn't a reboot (need to ride off more competent writing, even then IQ was meh)
Both ways just possibly can't exist.
Also this wasn't Miles and Kerry, this was Geoff. And pretty sure this statement was written before the series came out, so its likely they wanted to avoid spoilers and instead give the broad sense of establishing 'its a unique story except these first 3 episodes'
It just very obviously takes place between V1 and V2. The whole thing covers Weiss' arc of prejudice of Faunus, which wasn't an issue in V2 whatsoever.
But ofc worshipping RWBY writing and inaccurate statements doesn't get in the way of being able to just logically deduce its wrong.