The Arabic of the Koran makes that proclamation.
The term 'Muhammad' was a participle at the time that the Koran was penned, not a proper name....and literally means 'praised one'....same epithet as used in the Holy Bible for Jesus Christ.
Further, the only four times that the term is used in the Koran, it is in the context of Jesus' Biblical attributes.
You are making a common mistake of attempting to blend the fictitious Islamic Muhammad with the Koranic Muhammad.
We don’t praise the devil no matter what name is attached to his lying sign and wonders .
We praise the God of the scriptures alone.
Muhammad is a false prophet. The Koran false prophecy.
The last new prophecy before God sealed up the possibility with the last chapter of Revelation in His book, the bible. it is sealed from any hope of new prophecy.It was long established as a law for testing the spirits to see if they are of god or men . He failed.
Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
2Th 2:10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
2Th 2:11 And for this cause God shall send them strong delusion, that they should believe a lie:2Th 2:9
The devil is now bound from deceiving the nations through false prophets and their lying signs and wonders. The elect that heed the waning not to add or subtract now that we have the whole or perfect will of God . With them it is no possible to be deceived. Therefore is any man like Mohamed that says say thus sayith the lord, we are to believe not.
It all depends of what he reveals as prophecy,which again is sealed up, not the false prophets . To them Satan is not bound but its business as usual
And then if any man shall say to you, Lo, here is Christ; or, lo, he is there;
believe him not: For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce,
if it were possible, even the elect.Mar 13:21