I didn't research this Saga Phone deeper, and I didn't test it myself, but I don't consider this shitcoin wallet to be airgapped since it functions similar like regular smartphoens.
When we know how many times Solana shitchain stopped working, for various reasons, makes me trust even less their magical Saga wallet.
Any device that have bluetooth, wifi, nfc, phone aim tower connection, and internet connection, can't be considered airgapped device.
I don't know how their seed vault works (could be similar like Samsung and Google phones), but I wouldn't waste a single sat on this presale.