Actually, it would detect as 2FA enabled but if it was generated from the old version of Electrum it won't base on the recent thread below
Look at the recent thread here https://bitcointalksearch.org/topic/m.56372568
His seed doesn't show as 2FA enabled when importing it to the latest version of Electrum but since he mentions that it was generated on an old version of Electrum with 2FA enabled I give that link above and generated a new wallet file that solved his issue.
So I just trying to share the link above and maybe the seed he has is 2FA enabled.