No not at all. Let's go back to Strong's.Now, if "sarx" means "sinful nature" as the NIV translates in Romans 7:5, then the NIV is saying Jesus had a sin nature, although only folks who know the Greek would realize this.
The KJB consistently translates "sarx" as "flesh" in both Romans and 1 John. It does not say, or imply that Jesus had a sin nature.
sarx
probably from the base of 4563; flesh (as stripped of the skin), i.e. (strictly) the meat of an animal (as food), or (by extension) the body (as opposed to the soul (or spirit), or as the symbol of what is external, or as the means of kindred), or (by implication) human nature (with its frailties (physically or morally) and passions), or (specially), a human being (as such):--carnal(-ly, + -ly minded), flesh(-ly).
If you restrict sarx to only flesh/skin and bones, then we would have to say that when are in the spirit, we don't have any flesh or bones anymore.
Context, context, context. To be "in the flesh" also means to be carnally minded or to have a sinful nature.