Not in the least. He has brought the truth and confirmed the other messengers.
In fact he has brought the Truth, and testified for the Noble Messengers!
'No indeed; but he brought the truth, and confirmed the Envoys.
Nay, but he [whom you call a mad poet] has brought the truth; and he confirms the truth of [what the earlier of God’s] message-bearers [have taught].
Aye! he hath come with the truth, and he confesseth to the sent ones.
Nay! he (Muhammad SAW) has come with the truth (i.e. Allah's Religion - Islamic Monotheism and this Quran) and he confirms the Messengers (before him who brought Allah's religion - Islamic Monotheism).
In fact, he came with the truth, and he confirmed the messengers.
(They say so although) he brought the Truth and confirmed the veracity of the Messengers.
Nay! he has come with the truth and he confirms the Messengers.
Nay, but he brought the Truth, and he confirmed those sent (before him).
Indeed, he has brought [them] the truth, and confirmed the [earlier] apostles.
No, indeed, he has brought the truth, and confirmed the Messengers.
Rather, the Prophet has come with the truth and confirmed the [previous] messengers.
In fact, he had brought them the truth and had acknowledged the Messengers (who were sent before him).
Nay: he has come with the truth and verified the apostles.
Bal j<u>a</u>a bi<b>a</b>l<u>h</u>aqqi wa<u>s</u>addaqa almursaleen<b>a</b>
"Surely, he has brought the truth, confirming those who were sent before;
Nay! he has come with the (very) Truth, and he confirms (the Message of) the messengers (before him).
بَلْ جَآءَ بِٱلْحَقِّ وَصَدَّقَ ٱلْمُرْسَلِينَ
Verily, they have spoken a grave lie, because the Messenger of Allah (peace be upon him) was not a madman nor a poet; he brought the Qur’ān which calls towards the oneness of Allah and towards following His Messenger. He corroborated the message of monotheism and affirmation of the afterlife the messengers brought from Allah; he did not contradict them in anything.
Verily, they have spoken a grave lie, because the Messenger of Allah (peace be upon him) was not a madman nor a poet; he brought the Qur’ān which calls towards the oneness of Allah and towards following His Messenger. He corroborated the message of monotheism and affirmation of the afterlife the messengers brought from Allah; he did not contradict them in anything.