It's hard to know what the speaker means by the word along. It sounds unnatural to me because a) I've never heard 'walk along' used as a phrasal verb, and b) I can't work out what extra meaning along is supposed to provide. I would guess that he or she probably is using along with as a single preposition expressing accompaniment, as one would in a sentence such as One must consider the advantages along with the disadvantages. In other words, along with probably is one unit here, yes. I wonder how other members understand this.
Where did you hear this sentence? Can you provide the context?