There will certainly be fallback methods-- authenticator apps (which your mom won't understand either), a backup email address to send codes to or fall back to SMS codes as a last resort.
There are alternate 2FA methods that can be used if you lose your phone-- an authenticator app (which may have been lost with your phone as well), a backup email address or (as a last resort) fall back to SMS verification.
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There will certainly be fallback methods-- authenticator apps (which your mom won't understand either), a backup email address to send codes to or fall back to SMS codes as a last resort.
Then you aren't the target user. I doubt you even use 2FA, if you don't keep track of your phone. So this won't affect you.
As the article mentions, you can decline the invitation to switch to mobile prompts and continue to use SMS codes.
There are alternate 2FA methods that can be used if you lose your phone-- an authenticator app (which may have been lost with your phone as well), a backup email address or (as a last resort) fall back to SMS verification.