I was specifically addressing the biblical understanding of walking in the flesh, which appeared to have been used in the sense of the physical body. But biblically, in that instance, as it often does, “flesh” refers to the sinful nature. Of course, maybe the person did mean sinful nature but then I don’t see how that would fit the context of the post.
So, the post came across as: we overcome our physical flesh by walking in the Spirit. Of course, with Gnosticism, flesh is bad (hence the need to overcome it or do away with it) and spirit is good.
And, no apology is necessary if you misunderstood. It can be fairly easy for these things to happen.