Sure. But every person has interpreted it, including Popes and saints of before, as the same thing for ~2000 years. That is probably why we had it in the Church law in the first place.
I don’t know that there has been any showing of how long the practice has been in the Church on Holy Thursday, bet we will assume for the moment you are correct.
Then a person comes along and interprets it contrary to the standard and arrives at a contrary conclusion. Regardless of anything, does that not make you suspect the new interpretation? If anything, you can have layers of interpretation that do not contradict but enrich. But to have contradictory interpretations?
To begin with, it is not a contrary conclusion nor is it contrary to practice. To be contrary, one would have to not wash anyone’s feet. Contrary means opposite. This is not contrary, it is different. Feet are still washed; the question now is “whose feet?”. If only women were selected to have their feet washed, that possibly could be considered contrary; but certainly this is not the case.
Brother JR has answered this elsewhere far better than I can. The issue of washing feet is that Christ was trying to teach the apostles something; that is to say, this was a specific lesson to those 12. The fact that He washed the apostles feet has been interpreted as meaning that only men’s feet can be washed. That is a questionable assumption. What Christ did at that time was a specific instruction to the apostles, who were soon to be ordained (which occurs after the Resurrection, it would seem, when He breathed on them and said Receive the Holy Spirit… whose sins). However, if one wants to approach a literal interpretation of the washing of the feet, then arguably the only males who should have their feet washed are seminarians. It also has an underlying presumption that the lesson was only meant to go to the apostles, and that there is no lesson beyond that for the rest of us. Again; Brother JR lays it out better than I can.
The Church through time has emphasized the issue that it was the apostles feet, ergo men. However, that also can be a limiting of what Christ may have been trying to teach all of us, and that is the issue of humble service to others. If one looks at the wider teaching, rather than the narrower one, then washing the feet of women suddenly is a non-issue in terms of tradition.
Tradition has tremendous value. Tradition (with a small “t”) also can become such a rote process that we lose sight of the many facets of the original act and begin to have tunnel vision.
The Pope is the law giver in the Church, and for a rubric, he is not bound by laws given by prior Popes, or, for that matter, laws he has promulgated. Keep in mind that Benedict 16 was no slouch in understanding the laws of the Church, and there is a minor exception in the law of who may receive Communion; at John Paul 2’s funeral Mass Benedict gave Communion to a non-Catholic he most certainly knew (and he most certainly knew if this was appropriate).
Also, I thought Jesus washed the feet of Disciples. Are Muslims considered Disciples of Christ now too?
You are confusing to popular but not clearly defined terms. All people are children of God, as God is the ultimate source of life and of each individual’s life. So, Muslims, as well as Buddhists, Shintoists, Presbyterians, LDSers, atheists, agnostics, and everyone else are children of God and worthy of our respect.
That differs from the language of the New Testament where those who are baptized are spoken of as adopted sons and daughters of God.