Is saying that some people survived from previous nations and civilizations that Allah destroyed considered a denial of the verses of the Holy Quran?

It is a Muslim's duty to guard his tongue, for the Prophet, peace and blessings be upon him, said: "Whoever guarantees for me what is between his jaws and what is between his legs, I will guarantee him Paradise," and "Whoever believes in Allah and the Last Day, let him speak good or remain silent." An unintentional mistake is excused. One should turn away from obsessive thoughts and occupy oneself with what is beneficial.