If someone knows enough about your set up to make you a target for such an attack, can gain access to your airgapped computer, bypassing all physical and all electronic protections you have in place in order to install the necessary malware to start transmitting your private keys via modulating electrical signals in various internal components, as well as bugging your house with the necessary hardware in order to pick up and transmit those signals, then every single wallet you own is at risk (not to mention literally everything that you own). Such attacks are almost entirely theoretical.

I will never trust a software airgap (i.e. a phone with airplane mode turned on or WiFi turned off) as much as I will trust a hardware airgap (i.e. a computer with no WiFi card). It is almost trivial to open up a computer and remove the WiFi card, ethernet card, etc., while it is almost impossible to remove the antenna, WiFi, Bluetooth, NFC, RFID, etc. from your average smart phone without breaking it in the process. And how does the average person verify that airplane mode is doing what you want it to be doing. Even the NSA have admitted they can still track phones which are in airplane mode, so your phone must still be sending and receiving some data.