Nope, it shows up as being attached when I attach it.
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(you are literally believing what someone said
)
I'm not going to try and argue with anyone, but I modded my joycon this afternoon, I've used it to boot the Fusee Gelee PoC exploit and I've just booted fail0verflow's Linux kernel a couple of times, so I'm pretty darned sure it's working, and when I boot back into Horizon, the joycon shows up as being attached to the Switch. I can't tell you anything about what's going on under the hood, whether that icon is lying to me, etc. I can just report what I'm seeing, and when I have enough posts on this forum, I'll attach a pic.
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As far as I can see, yes they still work in tablet mode - at least the little icon at the bottom left of the Switch homescreen shows them both connected.