Firstly, lift has nothing to do with clearance for tire size. It's a misconception from the solid axle days, where lifting changes the functional suspension stroke. On an IFS, regardless of your lift, the tire still works within the same stroke. Just the resting point is at a different position. When articulating, the suspension still travels the exact same stroke, so you will want the tire to fully clear on compression.
To make it more concrete, the front has 9" of suspension travel. Normal ride height for example is at 4" remaining compression (5" droop). Lifting might change that to 6" of compression (3" droop). The suspension still travels the same stroke, just changing the neutral point.
The LX570 AHC suspension doesn't change any of this geometry. It's a different technology applied to spring and damping, but the arms and everything are the same, so same stroke and fitment applies. Other than we don't have the KDSS sway bar to interfere for wider tires. Though our sidesteps are a bit more prominent and may need cutting at the inside leading edge when fitting large diameter tires (~34") and aggressive offset.
To get to your question, 275/65r20 are on the big end. Can it be done, yes! It will need a bit of tucking and cutting of the plastics surrounding the wheel well. Much the same as would be done on the LC. Relatively easy mods (if you're okay with cutting), which in my mind is not a big deal, but it is for some.
Lifting is a separate question that comes down to your wants. AHC can easily be lifted ~1.5" with a 10mm wrench on the AHC height sensors. And still maintain full use of L/M/H positions, which will all be ~1.5" taller at their respective positions. Combined with the tire lift, that'll be over 3" of constant height lift. Plus you'd be able to manually select H, which puts you up to almost 6" lift overall.
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