Have you not read in the Torah were individuals are deemed 'unclean' for certain reasons?
Lev 15:8 -
And if the one with the discharge spits on someone who is clean, then
he shall wash his clothes and bathe himself in water and
be unclean until the evening.
Lev 17:15 -
And every person who eats what dies of itself or what is torn by beasts, whether he is a native or a sojourner, shall wash his clothes and bathe himself in water and be unclean until the evening; then he shall be clean.
Lev 22:4-6
None of the offspring of Aaron who has a leprous disease or a discharge may eat of the holy things
until he is clean. Whoever touches anything that is unclean through contact with the dead or a man who has had an emission of semen, and whoever touches a swarming thing by which he may be made unclean or a person from whom he may take uncleanness, whatever his uncleanness may be—
the person who touches such a thing shall be unclean until the evening and shall not eat of the holy things unless he has bathed his body in water.
Num 19:19
And the clean person shall sprinkle it on
the unclean on the third day and on the seventh day. Thus on the seventh day he shall cleanse him, and he shall wash his clothes and bathe himself in water, and at evening he shall be clean.
So you see, people are considered unclean by certain actions, and clean by certain actions.
The next mentions of clean and unclean are in the verses we are discussing, Deut 12: 15 & 22.
nonetheless, you still are ignoring by your interpretation that Moses is calling the Israelites both clean and unclean then .. or that the unclean would be given this revelation from God, and that the idol worshipers would even heed God ???
It seems to be you who have not understood about clean and unclean in regards to the Torah given Yisrael. All are bound under sin, no? The Messiah does not come to call the righteous, but sinners, to repent. The Torah magnified the sins, indicating to all that they can not find righteousness in 'doing' the law but through faith. The Torah sets the bar so high that it causes you to realize you can't reach it. When you get there you realize that God has given you a way, Messiah. He has reached it, and dwells in all who 'believe' in him. A sinner becomes a righteous person. You appear to have the sinner unable to approch God till he is clean. And that may be so in general, but in detail it is Messiah who comes to a fallen person and cleans them up. So at some point, the sinner does hear God right were he is at. It's this 'point' where tamei v'tahor collide. Like the point on the tire that meets the road. It moves relentlessly as time travels on. It's not a fixed point that you can remain static at. One must learn to move with God or they will be run over time and time again. Never truely understanding why this point exists or what it accomplishes.
Needless to say, you seem to have some roadblocks in your way. I don't see you understanding this properly to make the claims you have here. Israelites could be unclean, per Torah, and Deut 12:15 is about people, not meat.