Garmin ECG

But it's not the optical HR sensor that's doing the ECG, though, is it? 

No. Proper ECG requires electrodes, as I mentioned earlier. Thankfully it's nicely shown in the video on the previous page. Fenix 7 uses PPG optical sensor to capture HR & HRV. It's not possible to get any sort of close to reliable ECG readings without running electric current through our body. For a moment I was hoping that perhaps they somehow planned this in advance - hardware-wise, since the Fenix body is made of metal that can conduct the current (if only there would be some isolated metal part). Now it's kinda clear that there are no electrodes wires connecting to the bezel to use it as one contact point nor the other metal part, isolated from the rest of the watch case, to have it as the second electrode to let the 'magic happen'. It might be feasible if the underside  or any button would be electrically isolated from the rest of the casing / bezel / body in general thus allowing to have 2 electrodes. If that would be the case, we'd probably see it already in the not so long ago posted here article showing a Fenix 7 teardown :)

BTW - DC Rainmaker was first this time. Now DesFit also posted a video today about ECG on Garmin  Both seem to have synced in terms of posting this video pretty much at the same time. I'm guessing they had a 'stay quiet' policy from Garmin until a specific time (when they also posted their public article about ECG) and video publishing was probably scheduled to hit as soon as the ban is released :D

Can you turn off 2FA? Garmin is saying it's permanent... I wouldn't have turned it on had I known.

I don't see an option to do so. Maybe if lots of people will do a lot of fuzz about it it'll change or if you contact support to specifically request that. Or a brutal, hectic mode - export all data, create a new account without 2fa and import the data :D

That's what I see on the account in logon settings after enabling it.
Anyways it's safer, so I like it. I'm used to MFA / 2FA for so many accounts. I've just set it to an account I anyways have configured on at least one phone (not the safest approach, I know), so I always have that code available, when needed (even to get into this forum...).

My cardiologist recommended me an Apple Watch because the ECG function is spot on compared to a 12-lead ECG. He even  use the watch in his practice for some patients - So in terms of accuracy you will be suprised whats possible, but if Garmin venu 2 plus is the same story i dont know. 

- Apple watch only detects afib by it self, but the watch still gives you raw ecg data you can send to your local doctor.. The doctor can easily tell you if you heart rhythm is normal or you had  any abnormal isotopic beats

GCM > Settings > Profile & Privacy > Manage Garmin Account > Update Sign-On Settings shows toggles for email and SMS. When I set it up, I selected SMS and it shows as on. I can turn it temporarily off but it turns back on automatically.

For straight ECG an electrical pulse is used, distinct from the optical, but in terms of continuous detection of aFib, most watches use the optical sensor to raise the alert prompting you to take an ECG.

Yes, that's true, but that alert is only present on watches that let you take an "actual" ecg reading, like Apple's, Fitbit's or Withing's respective products. It's never optical only (?). 

Without said alerts, the app itself doesn't seem all that useful to me anyway.