I think you're missing the important point. He says we don't fulfill the law of Moses, we fulfill another law. But Paul said faith does not nullify the law of Moses, but fulfills it.
I have to agree with you on that count.
Paul in Romans 13 transcribed or placed every command in the scriptures to ONE LAW. That encompasses every command therein inclusive of the Law of Moses and any other command contained in the scriptures.
8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and
if there be any other commandment,
it is briefly comprehended in
this saying, namely,
Thou shalt love thy neighbour as thyself.
10 Love worketh no ill to his neighbour: therefore love is the fulfilling of the law.
There is also another reality set to observe for us all here, in the same chapter, Romans 13:
12 The night is far spent, the day is at hand:
let us therefore cast off the works of darkness, and
let us put on the armour of light.
13
Let us walk honestly, as in the day; not in rioting and drunkenness, not in chambering and wantonness, not in strife and envying.
14 But put ye on the Lord Jesus Christ, and
make not provision for the flesh, to fulfil the lusts thereof.
ALL of us know for no uncertain fact that we have works of darkness to CAST OFF. We are just not HONEST about having such. We are even LESS honest to source that problem.
The LIGHT ARMOUR however does bring everything into the LIGHT of exposure. When we are dishonest we are not bringing forth our own WORKS OF DARKNESS to cast off, but are led to cover and to hide no different than Adam and Eve hiding their sin away from God as blinded children controlled by the carnal flesh nature.
We try by that hiding to squeeze the entirety of ourselves through the Door of Heaven.
But
the works of darkness will NOT be let in. They must be cast off by LIGHT EXPOSURE. We can all chime in about how we are forgiven and how God in Christ doesn't count sins against us and all the good things. But we all remain quite entirely reluctant to just be honest about having such works of darkness.
We're not fooling anyone, least of all God in Christ.