I agree they'll walk it back as soon as it makes sense to do so, but not because they don't want to call a Biden win... but because it's their chance to get back on the fence in general, which is where any news organization should be at this stage. Overall, they have been calling states for Biden (and Trump) much sooner than most of the other news organizations, so they haven't shown any reluctance to calling it the way they see it. I wouldn't be surprised if they call a Biden win first -- it seems like they want to be breaking these calls and getting the traffic/views.

Brian Stelter (CNN Chief Media Correspondent/Anchor of Reliable Sources) said on Monday night that although the Fox Editorial department is a dumpster fire (not his exact words), the AP/Fox election desk is trustworthy and usually does a trustworthy job (it's not just Fox News alone, they're working alongside the AP).

I've been flipping through the networks and other than Fox News calling Arizona a little before they probably should have, they haven't shown any bias toward either candidate in the numbers. I can't say the same for the guests they have chosen to have on.

I bet Fox just holds back on calling NV for Biden (no need if something radical happens and it can be called for Trump) until both NV and either AZ is certain (and can either also be called for Biden or flipped for Trump without going in to an indeterminant state) or one of GA or PA (for Biden) is clear and can be safely called as well.