Look @ my source link in the changeset info.  It has the official detours on it, and it clears says that I-95 SB is open to Exit #30 now.  And it says that people can reenter NB @ Milnor Street.

I wouldn't have made this change if it wasn't backed up by PennDOT source material since I'm from the other side of PA.  Plus I've seen news reports showing traffic using said ramps. https://www.youtube.com/watch?v=nW9K1Z-j_-8 (skip to around the 3 minute mark).

Scroll down to "Southbound I-95 detour (local)" & "Northbound I-95 detour (local)" to see this.

As for that 'ramp', I know it's not open to I-95 NB traffic, as PennDOT is forcing everyone off @ Exit #26.  Not 100% sure if it's open to Betsy Ross Bridge traffic.