"Users who are already signed into their account on PlayStation Network
before the start of the maintenance should be able to stay signed in to
their online session, but will not be able to access any of the services
listed above. Users who attempt to sign-in to their PlayStation Network
account after the start of the maintenance may be presented with the
site maintenance notification page if they haven’t signed in recently."
they said you cant sign into your psn account on us.playstation or something. article said nothing about online play itself. just said can register, cant modify account, ect. logging in seems to be fine.