>the TVs in question don't appear to fold or come apart

No shit, but it would be helpful if you provided an example of the TV in question? Looks like their largest commercial screen of 97" is 'coming soon', it's just under 1.3M in height, I just measured a standard door@1.97M.

I'd guess they take the doors off or worst case, remove a window, like with a normal TV and whatever example you've seen LOOKS as though it's larger than the property's doorways, but in actual fact you're estimation of relative size is off.