I work at FB, and yeah, I'm not too fussed by this. Lying about where you are working from goes under the "don't be a fucking idiot" category, and I don't have much sympathy for idiots making life harder for their colleagues. Re "threats", location tracking of company equipment is pretty much a necessity to handle regulatory issues w/ geographies under sanctions (want to be an even bigger idiot? lie about where you're working from, and move to crimea!). Beyond that, internal systems also react to your location to do things like change the timezone displayed in UIs, adjust notification preferences, etc. HR having access to that data would be entirely unsurprising - if you're trying to defraud your employer, this is already in your threat model.
I'm not a FB employee but this doesn't faze me either. I would expect to be fired by any employer upon the discovery that I was committing significant tax fraud on my employer's income.
I'm just not used to your boss going straight to "We're going to enumerate all the ways we're going to fail to trust you, we've got no evidence you're going to do anything wrong, but we're still going to treat you like you are"
