ColdcardQ Airgapped Question

Hey guys. Throaway account cause I don't feel comfortable letting people know about my btc.

So I recently bought a coldcardq after researching for a month or so on best practices and how everything actually works. I'm a half-coiner on an exchange so I figured it was about time. I've familiarized myself with most of it, and I'm currently in the process of doing test transactions to get the hang of it. But I was wondering if the airgapped methods I've used *were* actually truly airgapped.

So I set up a pin on the coldcard, noted down my seed (nowhere digital), added a 13th word passphrase (which generates a different wallet from the master key), inserted a brand new micro-sd, installed sparrow on my desktop, loaded the json via microsd. Also installed nunchuk on my phone and played with the QR feature (which I feel is very convenient in general). I tested sending a small amount from the exchange via sparrow and nunchunk, and they both show up in my wallet.

Is that actually it? I didn't have to sign anything via the coldcard, or anything like that, I thought it'd be more complicated. Are the methods I used truly airgapped? I know that the sd json doesn't actually store the keys, but is there a risk involved with doing this?

Lastly, I've made a backup of my master key, but in case I lose access to my coldcard, will the backup also recover the passphrase wallet? Are there any other steps I should take before moving my full amount?

Thanks, and sorry for the long read.