It does not mean what you think it means. Ask any developer that is actually working on the code.
That is not an argument against "2 MB + Segwit".
Proposals like Lerner's "Segwit2MB" would activate the 2 MB hard fork after the activation of the Segwit soft fork. Maybe Lerner's 6 months (if I remember right) as "grace period" is too short because maybe until then most people would still use legacy transactions, but 1 year would be surely enough. We would then activate Segwit in mid-to-late 2017 and 2MB in mid-to-late 2018. Jihan as far as I remember mentioned the Hong Kong Agreement several times, so he should be happy with this solution.
I don't see how 2 MB + Segwit would avoid the quadratic problem on it's own. It needs to have some constraints on native transactions in order to work. Additionally, this creates a possibility of almost 8 MB blocks (if someone wanted to spam the network with this).