This can't be true because if you selected "Standard->I already have a seed", it'll not accept a 2fa-SegWit seed phrase (the Next button will not work).
The only way that it will proceed is if you've selected "BIP39 seed" in the seed type drop-down menu but that'll derive the wrong addresses
Or if the seed phrase is for standard Electrum wallet which will show under the text box where you type your seed phrase.