Daniel 11 mentions the covenant 5 times.

Once in line 22:

Daniel 11:22 And with the arms of a flood shall they be overflown from before him, and shall be broken; yea, also the prince of the covenant.

Was that speaking of the prince of of “peace treaty”?  That wouldn’t even make sense.

Then once in line 28:

Daniel 11:28 Then shall he return into his land with great riches; and his heart shall be against the holy covenant; and he shall do exploits, and return to his own land.

Does the holy covenant refer to a “peace treaty”?   No, I do not think so.

Then twice in line 30:

Daniel 11:31 And arms shall stand on his part, and they shall pollute the sanctuary of strength, and shall take away the daily sacrifice, and they shall place the abomination that maketh desolate.

Daniel 11:30 For the ships of Chittim shall come against him: therefore he shall be grieved, and return, and have indignation against the holy covenant: so shall he do; he shall even return, and have intelligence with them that forsake the holy covenant.

Again, why would a “peace treaty” be referred to as the holy covenant?

Also, it is mentioned in context of the abomination of desolation in line 31.

What would a “peace treaty” have to do with the abomination of desolation?

Then once more in line 32:

Daniel 11:32 And such as do wickedly against the covenant shall he corrupt by flatteries: but the people that do know their God shall be strong, and do exploits.

The covenant is mentioned in context, by contrast between those who know their God, versus those who do wickedly against the covenant.

So why in chapter 9, where first in line 4:

Daniel 9:4 And I prayed unto the LORD my God, and made my confession, and said, O Lord, the great and dreadful God, keeping the covenant and mercy to them that love him, and to them that keep his commandments;

God keeps his covenant, not a manmade peace treaty.

So, why, then in line 27, would the meaning of the word covenant, suddenly change to peace treaty?

Daniel 9:27 And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease, and for the overspreading of abominations he shall make it desolate, even until the consummation, and that determined shall be poured upon the desolate.