In my opinion, the Philadelphia accent doesn't necessarily strike me as sounding Southern, but certain features are vastly different from my own Inland North dialect and the dialects you will find in New York City and in areas further north. For example, Philadelphia speakers have a different cot/caught distinction than New Yorkers and Inland Northerners. Philadelphians also have a fronted diphthong in words such as "goat" and "boat"; they generally rhyme "on" with "dawn" instead of "don"; they have a very unique pronunciation for words such as "towel"; and they often merge "Merry" with "Murray". All of these examples could put them more into the Southern category, but the Philadelphia accent is very unique, and deserves a category of its own. Baltimore dialects, on the hand, strike me as sounding a bit more Southern, but most variations seem to have Philadelphianesque features.
As for the list you posted, I have never heard anyone from Western New York with Southern dialect features. I'm not saying it's impossible, but people from Western New York generally have a variation of the Inland North dialect. However, it would be very interesting to see the rural examples. Perhaps you could convince your friend from Western New York to upload a speech sample. I can't say that I have ever heard this in speakers from Oakland, but I have noticed it in speakers from the southern portions of Ohio, Indiana, and Illinois. I have found it as far north as Columbus, Ohio, but not all Columbus natives have Southern influences.
As for the list you posted, I have never heard anyone from Western New York with Southern dialect features. I'm not saying it's impossible, but people from Western New York generally have a variation of the Inland North dialect. However, it would be very interesting to see the rural examples. Perhaps you could convince your friend from Western New York to upload a speech sample. I can't say that I have ever heard this in speakers from Oakland, but I have noticed it in speakers from the southern portions of Ohio, Indiana, and Illinois. I have found it as far north as Columbus, Ohio, but not all Columbus natives have Southern influences.